HAMSTRING INJURIES IN TEAM SPORTS
A stretch or tear of one of the three large muscles of the back of the thigh comprising the hamstring muscle group (biceps, semimembranosus, and semitendinosus) typically occurs when these muscles are contracting forcefully during the sprinting or jumping action. Some studies indicate the injury is also more likely to occur in sprinters and other athletes as they run the curves on a 400-meter track.