According to an article on Researchgate.net published in Sports Medicine in 2012: “Hamstring strain injuries (HSIs) are the most prevalent non-contact injury in Australian football, American football, rugby union, soccer and sprinting. HSIs are characterized by acute pain in the posterior thigh.”
In a resistance flexibility study on hamstrings presented at the International Fascia Congress of 2012, Bob Cooley, an Olympic athletic trainer, found that it is possible to change the damaged fascia. In doing so, not only does the muscle itself increase in flexibility but its balancing quad muscle does also. The hamstring study also showed that the muscles increased in length at an uncharacteristically fast rate, making the hamstrings more flexible, reducing the likelihood of injury. Video data collected showed that resistance stretching provides benefits that traditional stretching and strength training do not.
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