Sports Legacy Institute “Hit Count” White Paper 

Click here to view the official “Hit Count” White Paper.

 (from Sports Legacy Institute)
Concussions have been making headlines in professional sports for the past five years, and recently professional sports organizations have taken unprecedented steps to protect athletes from concussions and minimize their exposure to repetitive brain trauma, including sub-concussive blows.

Unfortunately, youth sports organizations have not received the same public scrutiny, and therefore while most programs have taken positive steps on the concussion issue, few if any are actively working to limit exposure to sub-concussive brain trauma. Today, children are exposed to levels of brain trauma that are considered dangerous and unacceptable for adults.

It is time to take more aggressive steps to protect the developing brains of youth athletes.

We believe that the fastest and most effective path to safer youth sports* is to regulate the amount of brain trauma that a child is allowed to incur in a season and a year. Like youth baseball has widely adopted a “Pitch Count” to protect the ulnar collateral ligament of the elbow from wear and tear, we urgently call for the development and adoption of a Hit Count to limit the frequency of repetitive brain trauma. Theoretically, a lower Hit Count would reduce the risk of concussion, risk of brain damage from sub-concussive blows, and would theoretically reduce the risk of Chronic Traumatic Encephalopathy (CTE), a degenerative brain disease linked to repetitive brain trauma.

We do not claim ownership of this idea. A Hit Count has been proposed by prominent researchers, many of whom have provided the research evidence to support this policy proposal. Our goal is to make this great idea a reality.

To summarize, we are asking youth sports organizations to change the ways games are played and practiced, with the goal of significantly reducing the number of head hits children incur during sports participation. We hope that leaders of youth sports organizations can see the wisdom of this request.

 

Science

Scientific evidence exists to support Hit Counts.  There are still gaps and unknowns in the research connecting brain trauma to negative outcomes. As with most public health problems, we must make policy decisions before we have absolute knowledge of the issue, as we have with smoking policy. The world now acknowledges smoking is a risk for lung cancer. Has science definitively explained why only 10-20% of smokers die of lung cancer? No. Do we allow children to smoke? No.

Concussions/Traumatic Brain Injury:  Decades of studies have illustrated that concussions can have both short and long-term negative neurological consequences. For the sake of brevity, rather than provide a literature review it is simpler to quote the Centers for Disease Control and Prevention:

Traumatic Brain Injury (TBI) can cause a wide range of functional short- or long-term changes affecting thinking, sensation, language, or emotions.

  • Thinking (i.e., memory and reasoning);
  • Sensation (i.e., touch, taste, and smell);
  • Language (i.e., communication, expression, and understanding); and
  • Emotion (i.e., depression, anxiety, personality changes, aggression, acting out, and social inappropriateness).1

TBI can also cause epilepsy and increase the risk for conditions such as Alzheimer’s disease, Parkinson’s disease, and other brain disorders that become more prevalent with age.1 Repeated mild TBIs occurring over an extended period of time (i.e., months, years) can result in cumulative neurological and cognitive deficits. Repeated mild TBIs occurring within a short period of time (i.e., hours, days, or weeks) can be catastrophic or fatal.2

Sub-concussive Brain Injury:   Evidence is accumulating that sub-concussive impacts, or impacts that do not produce any clinical concussion symptoms, may still be damaging to the brain, both in the short- and long-term.  One study on high school football players found that players who received normal football brain trauma and did not report any concussion symptoms still had functional MRI changes that mimicked concussion players.3

Chronic Traumatic Encephalopathy:   The evidence connecting brain trauma to CTE is older and more robust than many believe. It was first identified and named “Punch Drunk” in 1928, and both clinical4 and pathological5 studies have revealed that:

  1. There is a distinct pathology in the brains of victims of repetitive brain trauma
  2. Everyone diagnosed with CTE upon autopsy (now over 100 cases) received extraordinary brain trauma
  3. There are no reported cases of CTE pathology in individuals who did not receive abnormal and excessive repetitive brain trauma
  4. CTE risk appears linked to lifetime brain trauma exposure rather than diagnosed concussions

Referring back to the smoking analogy, smoking as a risk factor for lung cancer becomes even more interesting. Smokers are ‘only’ 15-30 times more likely to develop lung cancer than non-smokers.6  Brain trauma victims are infinitely more likely to develop CTE, because no one has ever been diagnosed with CTE who was not exposed to that risk factor.

There are no recent epidemiological studies of CTE. One random sample of 250 boxers in the United Kingdom found that 17% had indications of CTE using primitive techniques of the time. At the Boston University Center for the Study of Traumatic Encephalopathy, a non-random sample of over 40 athletes who played ten or greater years of American football, with or without a history of other sports, has found that over 90% of cases are positive for CTE.  The incidence and prevalence is unknown at this time.

The hypothesis that CTE is linked more to lifetime brain trauma exposure rather than concussions is admittedly tenuous. Historically, concussions have not been reported – some estimates indicate fewer than 10% of concussions end up in a medical report – so it is impossible to know any individual’s true concussive and sub-concussive history. Whether or not the cause of CTE is only concussions, sub-concussions, or a combination of both, a Hit Count would limit exposure to either or both types of brain trauma would theoretically reduce one’s risk of CTE.

Therefore, the science supports limiting an athlete’s lifetime exposure to brain trauma.

 

Brain Trauma Exposure Data

Due to recent technological advances, we now have a better idea of the frequency and force of brain trauma received by athletes in football and hockey.* The table below includes most, but not all, studies on the frequency and severity of impacts in football and ice hockey. There is no similar published data on other contact sports.

Sport & Study Level Mean Hits Peak Hits Mean g- force
Football
Crisco et al7  College 420** 1444 21**
Mihalek et al8  College 950 - 22
Schnebel et al9 College 1353 - -
Broglio et al10 High School 652 2235 -
Schnebel et al11 High School 520 - -
Talavage et al12 High School / 1855 /
 
Ice Hockey
Brainard et al13 College Male 347 785 -
  ibid College Female 179 373 -
Reed et al14  Age 13-14 140 255 22

** Median

“-“: not reported    “/”: not applicable to study

At this time no published data exists for football below high school. This data, from a limited number of teams and players, reveals that:

  • Football players may receive 2,500 hits to the head exceeding 10g’s each season
  • The average may be around 1,000 hits per season
  • The mean hit is just over 20 g’s
  • There is little difference between head acceleration in college and high school football

In hockey, players receive only a fraction of the number of hits to the head, but some male players still receive near 1,000 blows to the head per season. Due to technology limitations, soccer remains an unknown, although anecdotal evidence suggests that some individuals are involved in thousands of headers per season, mostly in practice.

 

Brain Injury and Age

The fact that the data indicates youth athletes are exposed to brain trauma with high frequency and severity is concerning, as most experts agree that the young brain is more vulnerable to trauma than the mature brain. The young athlete is at biomechanical disadvantages as well, as their head reaches 90% of full size by age 5, yet their body is only 20% of adult mass. Young athletes also have an absence of medical resources to help identify when a concussion has occurred.  Among many other disadvantages, studies show children lack the knowledge and verbal skills to report concussion symptoms to adults.

 

Ethics

The other major problem with this data is the medico-legal concept of “informed consent.” The laws of our society are constructed around the idea that human beings below the age of 18 are not developmentally mature enough to fully understand the consequences of their actions, and therefore cannot give informed consent.  We have a separate court system for children, they cannot vote, and they cannot serve in the military or own firearms.

In the United States we are in the middle of a national discussion about whether or not professional football and hockey are too dangerous for the participants, and yet we expose children to the same sports without their informed consent.

 

Changes in the Pros

The ethics issue becomes even more complicated when we realize the efforts that professional athletes have made to protect themselves from brain trauma.

  • While negotiating the collective bargaining agreement in 2011, the National Football League Players Association and National Football League agreed to reduce the amount of full-contact practices, with the goal of reducing brain trauma exposure. Teams are permitted a total of 14 full-contact practices for the year with 11 of those practices conducted during the first 11 weeks of the season. Youth football has no regulations, and some teams scrimmage four times a week and play two games on weekends.
  • The NFL and NFLPA recently added an athletic trainer to the press box during games to help identify concussions.
  • The Ivy League recently voted to limit brain trauma exposure, stating “Because of the seriousness of the potential consequences, the presidents determined the league needed to take proactive steps in protecting the welfare of our student-athletes.” Teams are only allowed two full-contact practices a week (rather than the NCAA limit of 5) and two-a-day full-padded practices were banned.

No such changes have been proposed or launched in youth football, youth soccer, or rugby, the three sports with arguably the most repetitive brain trauma risk. No one has asked football coaches to reduce hitting in practice, or soccer coaches to consider reducing or tracking the frequency of headers, especially in practice.

It is important to recognize that the people making the decisions about how much brain trauma we expose children to are not the individuals receiving the brain trauma.

When those athletes have been consulted, they have asked for greater protections against repetitive brain trauma.

Consider that NFL players, some of the toughest athletes in world, have asked to be hit in the head less frequently.  We imagine if we asked children if they wanted to be hit in the head fewer times, they would say YES!

Yet the children have no voice.

 

To Act or Not to Act

The decision now is to choose whether or not to establish regulations. The risk of inaction is that we continue to diminish the futures of athletes through unregulated and unnecessary brain trauma.  Some experts have stated that we should not act until we know the incidence and prevalence of CTE to ensure we do not overreact.

We believe the true incidence and prevalence of CTE in the population to be irrelevant to this policy decision. What percentage of youth football players with greater than four years of experience, e.g. high school seniors, developing CTE is acceptable in our culture? I challenge anyone to propose a non-zero number. Two players, one 17 and 18 one years-old, have already been identified. A younger athlete who played multiple years of contact sports has yet to be studied.

 

Implementation          

There are technological and monetary limitations to a pure Hit Count, as Hit Count systems currently are only sold for helmeted sports, and there are costs involved.  A Hit Count is not as simple as a pitch count, where coaches only need a pencil and paper.

However, hits to the head can be accurately estimated, and methods can be developed to approximate the brain trauma exposure during games and during practice based on known variables, like position.  With these estimations, rule changes and practice guidelines can be provided to ensure few, if any, athletes exceed a proposed limit.

Little League pitch counts are limits on the number of “pitches thrown per day” and mandate up to three days of rest after exposure to elbow trauma to allow the ulnar collateral ligament to recover.

A Hit Count should explore the following guidelines:

  1. Minimum threshold to be considered a “Hit”
  2. Maximum Hits per day (all counts stratified by age)
  3. Maximum Hits per week
  4. Maximum Hits per season
  5. Maximum Hits per year
  6. When the technology is available, should there be a “Total Force” threshold derived from number of hits times mean force per hit
  7. Minimum required days of rest after a minimum brain trauma exposure

In football, a Hit Count might lead to fewer practices that involve helmets and pads or the limits on the use of high impact drills. In soccer practice, it may mean tracking headers in practice and games. This policy is probably most critical to the youngest athletes, who may be at the greatest risk, and should receive less brain trauma than older athletes.

 

Goals

The goal of this proposal is to have a Hit Count adopted by major youth sports organizations by 2013.

The next step will be to convene a meeting of experts, sports organizations, thought leaders, and industry to explore the current state of knowledge and the steps that would need to be taken to establish, adopt, and measure a Hit Count.

To start the conversation, we would like to propose that no athlete under 18 years-old be exposed to more than 1,000 hits to the head exceeding 10 g’s of force in a season, and no more than 2,000 times in a year. Many youth athletes already exceed this high threshold, and would not be allowed to finish a season.

* We would like to specifically express gratitude to the Simbex Corporation, who developed the HIT system, and the researchers who have published studies using HIT and other methods, without which we would not have this information.

___________________________________________________________________________________________________________________

[1] National Institute of Neurological Disorders and Stroke. Traumatic brain injury: hope through research. Bethesda (MD): National Institutes of Health; 2002 Feb. NIH Publication No.: 02-158.

[2] National Institute of Neurological Disorders and Stroke. Traumatic brain injury: hope through research. Bethesda (MD): National Institutes of Health; 2002 Feb. NIH Publication No.: 02-158.

[3] Talavage T

[4] Roberts AH. Brain Damage in Boxers. London: Pitman Publishing; 1969

[5] McKee AC, Cantu RC, Stern RA et al. Chronic Traumatic Encephalopathy in Athletes: Progressive Tauopathy following Repetitive Head Injury.  J Neuropath Exp Neurol, 2009; 68(7): 709-735.

[6] CDC.  http://www.cdc.gov/cancer/lung/basic_info/risk_factors.htm

[7] Crisco JJ, Fiore R, Greenwald RM. Frequency and Location of Head Impact Exposures in Individual Collegiate Football Players Journal of Athletic Training 2010;45(6):549–559

[8] Guskiewicz KM, Mihalik JP, Shankar V, et al. Measurement of head impacts in collegiate football players: relationship between head impact biomechanics and acute clinical outcome after concussion. Neurosurgery. 2007; 61(6):1244–52; [discussion 52–3].

[9] Schnebel B, Gwin JT, Anderson S, Gatlin R. In vivo study of head impacts in football: a comparison of National Collegiate Athletic Association Division I versus high school impacts. Neurosurgery. 2007; 60(3):490–5

[10] Broglio SP, Eckner JT, Martini D, Sosnoff JJ, Kutcher JS, Randolph C. Cumulative head impact burden in high school football. J Neurotrauma. 2011 Oct;28(10):2069-78.

[11] Schneibel B et al. In Vivo Study of Head Impacts in Football: A Comparison of National Collegiate Athletic Association Division I Versus High School Impacts. Neurosurgery. 2007; 60:490–496.

[12] Talavage, T et al. Functionally-Detected Cognitive Impairment in High School Football Players Without Clinically-Diagnosed Concussion. J Neurotrauma. 2010 Oct 1.

[13] Brainard et al. Med Sci Sports Exercise. Gender differences in head impacts sustained by collegiate ice hockey players. 2012 Feb;44(2):297-304

[14] Reed N. et al. Measurement of Head Impacts in Youth Ice Hockey Players. Int J Sports Med 2010; 31: 826 – 833

Group Encourages Counting Hits to Prevent Concussions
Emily Attwood — Athletic Business Associate Editor

New emphasis is being placed on the number of head impacts a player suffers during a game rather than the intensity of the hit. The Indiana-based Sports Legacy Institute on Friday announced its “Hit Count” proposal, aimed at reducing the number of concussions and amount of brain trauma suffered by youth athletes. Based on the “Pitch Count” model used in baseball to reduce the risk of overuse injuries in pitchers, the Hit Count model would set a limit for the number of hits to the head a young athlete can undergo during a period of time.

“Professional and college sports organizations, including the National Football League (NFL) and the Ivy League, have taken aggressive steps to reduce sub-concussive brain trauma exposure, but those steps are not being adopted at youth levels where athletes are most at risk,” said SLI co-founder Chris Nowinski in a press release. The NFL has policies in place aimed at reducing the frequency of hard hits during practice and games, unlike youth sports, where the number of hard hits a player endures is rarely monitored.

SLI may find support for its model in the results of a two-year study of high school football players conducted by the Purdue Neurotrauma Group and summarized in a paper appearing this month in the Journal of Biomechanics. The group’s research suggests that each hit to the head an athlete suffers during a game affects their brain activity, and that the buildup of prior damage can be a greater determinant in whether a player suffers a concussion than the force of a hit.

“The most important implication of the new findings is the suggestion that a concussion is not just the result of a single blow, but it’s really the totality of blows that took place over the season,” said Eric Nauman, a coauthor of the paper and associate professor of mechanical engineering at Purdue. “The one hit that brought on the concussion is arguably the straw that broke the camel’s back.”

Whether a player suffered a concussion or not, brain imaging scans showed that repetitive hits to the head caused brain activity changes in the areas of the brain associated with chronic traumatic encephalopathy, a degenerative disease currently affecting more than 20 former NFL players and commonly seen in athletes involved in impact sports such as football, hockey, rugby and soccer.

The Purdue Neurotrauma Group plans to continue its research, both monitoring participants of the original study for evidence of permanent changes in brain structure and expanding their scope to include more high school football players and girls’ soccer players. The group’s future research may help establish safety guidelines specifying the number of hits a player can receive during a period of time, exactly what the SLI is calling for with its Hit Count White Paper, which outlines the project’s goals and a strategy for implementation. SLI hopes to have Hit Counts in use by youth organizations by 2013.

All too often high school athletes undergo the violent blow that possibly leads to a concussion. It’s very important to note the symptoms are not just physiological. High schoolers may have to deal with psychological dilemmas that force them to conclude what’s more important; playing one more play that could cost them their long term health or rest. Choosing to rest until they are completely recovered isn’t as easy as one may think.

Caroline Metcalf-Vera describes the insecurities she had to deal with before deciding that playing just wasn’t worth her health and possibly even her life.

Caroline describes….

“Now three months out, and I just suffered a second concussion. I am currently not even allowed to participate in a full day of school. I’ve learned the hard way that your brain is important, and the consequences of getting back out on the field before you are fully healed are not worth it.”

Click here for the rest of the article on ESPN

 

John Niyo of the Detroit News recently wrote an article about NFL players taking concussions more and more seriously. Here is an excerpt of the article with a link to the full version at the bottom.

Allen Park — Don Muhlbach, the veteran long snapper for the Lions, doesn’t remember his first — and only — concussion as an NFL player.

He remembers the first quarter of that December 2009 game at Baltimore, but not the next three watching from the sideline after taking a blow to the head on punt coverage. He remembers the flight home to Detroit, with team doctors refusing to let him sleep, checking him every 10 minutes. He remembers Drew Stanton driving him home from the airport.

Oh, and he does remember a conversation he had with kicker Jason Hanson in the postgame locker room.

“I remember asking him if we won,” Muhlbach said with a laugh — the Lions 48-3 loss that day was the team’s worst since 1991 — that comes freely now. “Jason just told me to be quiet.”

Quietly, though, Muhlbach remembers much more about how he felt — about how scared he felt — after that concussion. And it’s memories like that, along with increasingly-stringent rules in the NFL and some of the emerging stories involving retired players and the tragic effects of brain injuries, that are helping everyone in the NFL come to terms with a new reality.

Raising awareness

Amid speculation about the health and immediate future of Lions running back Jahvid Best, who suffered his second concussion in two months after a college career cut short in 2009 by concussions, the subject is unavoidable in Allen Park this week. (Linebacker Justin Durant and tight end Tony Scheffler also are working their way back from concussions suffered during the last month.)

But that’s true across the league, with a new sideline protocol in place this season helping raise awareness. Where concussions once were an afterthought, treated like notches on a belt, they’re gradually being viewed more for what they are: bullets in a chamber.

Arizona has taken the first aggressive steps of any state, in educating it’s youth on what concussions are, how dangerous they can be, how they occur, and how they should be treated.

“Arizona is leading the next phase of concussion education and management. In August, the Arizona Interscholastic Association — following the April passage of a state law that requires schools to provide training about the dangers of traumatic brain injuries — introduced a mandatory program in which all high school sports participants must take a 50-minute multimedia online course and pass a formal test before they put on a uniform.

Click here to read the rest of the article and compare where your state stands for educating and protecting its youth athletes.

Alexis Ball, a La Cueva High school valedictorian and former University of New Mexico soccer standout, once was unstoppable on the playing field and in the classroom.

After earning top scholastic honors and being named New Mexico’s Gatorade Player of the Year at Albuquerque’s La Cueva in 2007, the speedy midfielder went on to become the University of New Mexico’s leading goal scorer in 2007 and 2008 and earned all-conference honors. But a series of 10 concussions in high school and college eventually took their toll, and she began suffering debilitating headaches, dizziness and depression.

In 2009, Ball was forced to hang up her cleats and retire from soccer for good.

Ball, now a senior at UNM, on Wednesday urged members of Congress – and the general public – to take concussions seriously and asserted that “most coaches and athletes do not truly understand the long-term ramifications of concussions.

“”Concussions adversely impacted my life,” Ball testified during a hearing of the Senate Commerce Committee that included medical experts and a spokesman for a national committee on sports equipment. “I hope from my story you have learned that concussions and brain injury are not a minor injury.”Ball said she decided to retire from soccer after consulting with her doctors about the long-term damage she could sustain if she suffered another concussion.

Read the rest of the article at http://athleticbusiness.com/articles/lexisnexis.aspx?lnarticleid=1525504532&lntopicid=136030023

I found the article below today on HeavyFists.com. It’s interesting to see the boxing world taking notice of the fact that strengthening the neck has positive benefits. It’s unfortunate, however, that their recommendations are so lame it’s almost funny.

Training the musculature of the neck and head requires a great deal of attention to detail and proper progression. The neck is the last area of the body you want to train improperly because you don’t want to create more problems by doing things the wrong way.

Here is the article so you can see for yourself. Don’t get me wrong, it’s awesome that people are getting more informed about the benefits. The next step is teaching people how to do the strengthening correctly. We’re working on that, and there is plenty more to come.

Strengthen Your Neck to Take a Punch

There is plenty of evidence that fighters can “improve their chin” by strengthening their neck muscles.

If you think you have a weak chin or a glass jaw, bulk up your neck.

On the web, there are many folks who will advise you to do wrestler’s bridges to build your neck. I don’t agree with this idea. Wrester’s bridges are fine for wrestlers because they need to keep their backs off the mat to avoid losing a wrestling match. But for the rest of us, they’re the wrong exercise because they put major stress on the spinal ligaments and only work the neck muscles as an afterthought.

Here’s how to strengthen your neck so you can take a punch:

Get a long towel and wrap it around your skull. Then, have your training partner grab either end of the towel and carefully pull. You’ll have to counter this pulling with your neck muscles. Your partner is creating resistance and you are using it to train your neck muscles.

Or, use a flat resistance band for neck strengthening exercises. This makes it easy to get a good neck workout without a partner.

An alternative is just to use your hands to create resistance. This works well in the beginning stages. Later, you can invest in an inexpensive neck developer that will let you work the neck muscles against resistance provided by weight plates.

The Virginia Tech researchers responsible for the STAR rating system for football helmets have been using the same impact tracking technology on youth football players. The researchers collected data on their own football team for several years in an effort to track the number and force of impacts the players encountered during practices and games. This research lead to the eventual testing of helmets which created the rating system.

The new research is focusing on youth football and eventually will lead to the rating of youth helmets. While the original research was groundbreaking, the new study may actually impact even more athletes worldwide because of the number of youth athletes is much higher than in college sports.

You can read more about the youth concussions study here.

Most of us who have played football, are completely aware of the day we received our equipment. Even in college I stood in line, tried on a couple helmets and picked one that wasn’t too dinged up and fit decently.

That’s not good enough anymore and Gregg Easterbrook from ESPN has is informing us that research from Virginia Tech University may be supporting this.

“For years, football players, coaches and the parents of young players have been in the dark about which of the many helmets on the market may reduce the risk of concussions. The NFL does not mandate helmet types, while many NFL teams refuse even to reveal which helmets their players wear. The National Operating Committee on Standards for Athletic Equipment, which certifies sports equipment, has been AWOL on the issue of helmets and concussions. There’s been no place for the player seeking helmet safety information to turn. Now all that has changed.”

Click here to read the rest of the article and to learn which helmets could possibly minimize the risk of a concussion. You may even find out that you or someone you know is using a helmet that is ranked very poorly.

Keep coming back for more information on neck training and the pro-active approach we’re taking to prevent concussions.

First a brief point….We lift weights in order to reduce the risk of injury. If any strength and conditioning professional tells you different, they are either lying or have been seriously misinformed. Since we are participating in lifting weights to get stronger, lifting weights is obviously not supposed to be a means to a permanent end. Getting hurt in the weightroom while lifting weights can happen, but it’s moronic to not constantly think about how to not only minimize this risk, but eliminate it. That is why performing repetitions correctly while training your neck is a necessity.

The cervical spine, tendons, and ligaments can be strong and they can be strengthened. However, with that aside it is still one of the most delicate places on the human body. Which is why the type of training needed to strengthen that area must be logical and very carefully implemented.

The “repetition” is probably the most fundamentally basic point in resistance training. Which is why we’re going to start there. These principles can be applied to manual resistance neck training, free weight training, and machines. It does not matter what movement you are performing; front neck, back neck, right/left neck or so on.

Think about performing neck training as a “pulling” movement. Therefore, the full contraction contains the concentric movement, a middle point with great tension, and the eccentric movement.

While performing the concentric movement, use a 2-3 second count. Counting 3 seconds for a movement goes like this; one thousand and one-one thousand and two-one thousand and three. Yes, it’s slow. Then, the pause in the middle of the two contractions should be a “one thousand and one” count. Again, it’s a slow count. The last portion of the repetition is a 4-count eccentric. Count it off in thousands just like before.

Counting it off in those counts does indeed turn it into a long repetition and a long set. Having someone count out loud for you can always help. Using these speeds for your repetitions can possibly make your neck training safer. If the repetitions have been much faster than these counts, it will vastly improve the efficiency of the training.

We hope you can use this as part of your neck training.

Train Hard

Adam Stoyanoff MS, CSCS

Keep coming back to PreventConcussions.com for more neck training information.