The recurrent hamstring strain is a problem that is dealt with at all levels of athletics. The complex action of the hamstrings, as evident by EMG data, as well as a poor understanding of the mechanism of injury, are possible reasons for this high rate of reinjury. Another possible cause deals with the rehabilitation protocol utilized in treating this injury. Early controlled motion and specific exercises designed to apply to the unique characteristics of the hamstring muscles are necessary to completely rehabilitate the athlete and successfully prevent a recurrence. This program must include a progressive resumption of activity with an emphasis on high speed movements. A model hamstring rehabilitation program is proposed. J Orthop Sports Phys Ther 1987;9(2):77-85.