Leg-changing jump refers to a regular jump in which the legs are alternately lifted high; Half-squat step jump refers to a jump in which the upper body and legs look forward basically vertically, similar to leapfrog; Starting from both ends means that people lie flat on the mat, their waist is kept on the mat, their heads and legs are upright, and they are concentrated above the abdominal eyes; Starting from the opposite direction at both ends, it means that people are lying on the mat, with their heads and legs upright and concentrated above their abdominal eyes; Vertical jump refers to jumping up behind your hands, your legs slightly bent, your waist erect, your eyes forward and falling into the distance. Family words are for reference only.