In brief:Fifty-three male high school students aged 13 to 18 participated in a leg strength study to determine whether variable resistance (isotonic) or accommodative resistance (isokinetic) training was superior in developing leg muscle strength, endurance, and performance. Subjects were randomly assigned to three experimental groups: one that trained on isotonic equipment, one on modified isokinetic equipment, and a control group. The results suggest that training equipment can be used to increase strength, muscular endurance, and performance. However, there appears to be no clear superiority of one type of equipment over another when using the same training method.