Countermovement Jump

A countermovement jump (CMJ) is a common movement test used to assess leg strength and explosive power. It involves a person starting in an upright position, quickly bending their knees and hips to prepare for the jump, then immediately jumping upward as high as possible. The initial downward movement helps muscles generate maximum force, which enhances the upward thrust. Athletes often use CMJs to measure athletic performance or track progress in training, as they provide insight into muscle power, coordination, and efficiency in converting strength into movement.