Most hamstrings muscle strain injuries occur while running or sprinting. Researchers have reported that hamstrings strain accounts for 50% of all muscular injuries in sprinters,1 with an incidence varying from 10% (1-year follow-up) to 24% (2-year follow-up). In addition, the hamstrings are the second most common injury site in team sports, but the incidence of injury can vary from one field position to the next. In rugby, the incidence is greater for backs than forwards, probably due to their greater acceleration, deceleration, and high-speed running demands.4 In football, the speed-position players (ie, wide receivers, defensive secondary) are at elevated risk for injury.5 In Australian Rules football, hamstrings muscle strain is the most frequent injury that results in time missed from participation.6 In soccer, muscle strains
represent 30% of the injuries, and 28% of these strains involve the hamstrings