This study is developing a computational method that will be able to accurately examine how sex differences in muscles and bones influence the lower limbs during movement. For this reason we must collect information about your assigned sex at birth, weight, and height. The study will involve: -screening (~5 minutes) -strength testing and motion capture testing (~3.5 hours) -MRI scan (~ 1.5 hours). Completing the study will result in compensation through an $80 Amazon Gift Card. This survey will take ~ 3 min to complete.