Jumping jack
01
开合跳, 跳跃杰克
an exercise that is performed by jumping from a standing position with legs both spread wide and the hands touching overhead and then returning to a position with the feet together and the arms at the sides
例子
She did a series of jumping jacks before starting her workout to loosen up her muscles.
她在开始锻炼前做了一系列开合跳来放松肌肉。
02
a toy figure with movable joints that can be made to dance or move by pulling attached strings
