Countermovement jump (CMJ)
A vertical CMJ was used to assess lower-body explosive strength after stretch shortening of the muscles. To avoid immeasurable work, horizontal and lateral displacements were minimized, and the hands were kept on the hips throughout the jump. During CMJ, the angular displacement of the knees was standardized so that the subjects were required to bend their knees to approximately 90°. The participants were instructed to freely flex the knees and to jump once as high as possible.