Abstract: The examination of performing lengthened partial repetitions against the effects of performing full range of motion repetitions remains understudied.  We have implemented a within participant crossover design to compare the estimated one-rep maximum strength in a full range of motion one-legged leg press, as well as the vertical height difference on the split squat jump (measured using a Vertec Jump Trainer) between intervention and comparison legs. Subjects have been randomly assigned in a counterbalanced order between dominant and non-dominant legs, one leg to train the lengthened partial range of motion (90°-120° knee flexion), while the contralateral leg performs full range of motion (90°-180° knee flexion) repetitions. Our goal was to have participants perform one-legged leg press training twice a week, for six weeks, for five sets of five to ten repetitions per leg per session. After a recruitment period, we began the study with four participants. Pre and post strength and power outcomes were assessed one week prior to, and will again be one week following the completion of the training protocol for delta changes (subtracting post-test measures from pre-test measures). We hypothesize that strength training using lengthened partials will result in significantly greater increases in muscle strength and power compared to full range of motion repetitions. The data will finish being collected and analyzed in April.