s did not change for the CONT, EX-1, or EX-3 groups. Magnitude of change in muscle thickness of the medialis was similar for the EX-1 and EX-3 groups, it only reached significance relative to the CONT group in the EX-3 group. Muscle thickness for the posterior 40% and 60% increased significantly and of similar magnitude for both the Ex-1 and EX-3 groups compared to the CONT.There were no differences in dynamic training weight, isometric torque output, and muscle thickness between training with one and three sets of KEXT and KFLEX exercise performed to fatigue within 8-12 repetitions three times per week. The data support the conclusion that one set of KEXT and KFLEX exercise performed to fatigue is as effective as three sets three times per week for increasing torque output and increasing muscle thickness. ...