Are your hamstrings wrapped tightly like coils all the time? Exercise physiologists at the University of Wisconsin-La Crosse have the remedy for tight hamstrings: foam that rolls 3 × 20 seconds per leg three times a week significantly improves flexibility without affecting athletic performance.
Compare that to static stretching, which is “like tearing apart Velcro,” says study author John P. Porcari, Ph.D. “They can damage cross-bridges in muscle fibers that allow them to contract and generate strength.”
To roll out properly, “slowly work the length of the muscle, using as much force as you can tolerate. It creates friction that builds up heat and makes the muscle more supple. “
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