[Vincent Ragland is in his last semester as a student-athlete at East Carolina University, pursuing a Health Fitness Specialist Degree. He is currently in the Coaching Mentorship Program at Athletic Lab] A hamstring strain is one of the most common injuries in all sports, specifically ones involving high intensity sprinting. Aside from the physical damage associated with a pulled hamstring, there are psychological damages associated with an injury as well. For example, a high-level sprinter who has strained their hamstring in the past will almost certainly never run a race again in their life without the thought of that pull being in the back of their mind. As with many injuries, the major problem associated with a hamstring injury is the risk of a re-injury, with nearly 30% of strains resulting in such. There seem to be two main reasons why researchers believe there is such a high prevalence of re-injury. For one, muscle tissue will not completely regenerate after a strain has occurred, and two, a weakness of the hamstring muscle or hamstring/quadriceps imbalance. After a hamstring strain occurs, scar tissue emerges in the location of the injury. The emergence of scar tissue increases the likelihood of re-injury and also limits the range of motion in a strained muscle. The most common mechanism of re-injury is when an athlete returns back to sport before the injury is completely healed and fully functioning. A study by Brian Cammarota shows that nearly 83 percent of hamstring re-injuries occur because an athlete attempts to return too soon. Similar studies show that 20-55% of the original injury had not healed in six weeks. (Cammarota et.al, 2013). Typically, when an athlete suffers an injury, they want to know how [...]