Training program
Subjects were asked to achieve at least 7 h of sleep at night, and to avoid any other exercise training, except the PJT protocol during the study period. Before the beginning of training and testing, all subjects participated in a familiarization session covering all training and testing requirements. The training protocol comprised 2 sessions per week (Sundays and Wednesdays morning, at 9:00–11:00 am) of 4 exercises including countermovement jump, push-up jump, lateral skater jump, and incline push-up jump, across 6 weeks of training (