The squat also is becoming increasingly popular in clinical settings as a means to strengthen lower-body muscles and connective tissue after joint-related injury. It has been used extensively for therapeutic treatment of ligament lesions, patellofemoral dysfunctions, total joint replacement, and ankle instability (14,56). Moreover, the closed-chain stance required for performance reduces anterior cruciate ligament (ACL) strain (64), making it superior to the knee extension for rehabilitation of ACL injury (21,65)