The result proved that the time supplemented, the jumping time of cross steps, sustaining time of double support was highly related to the final results.
研究结果表明，增补的时相，交叉步腾空时间、双支撑持续时间与标枪成绩的关联度较高。
2
Some alternatives to foot work would be a double under (jumping high in a tuck jump position and turning your hands fast so the rope will go under twice before you land).