Your hands control the tension in your upper body, while your arm swing works in conjunction with your leg stride to drive you forward.
你的手控制着你上半身的紧张程度，而你的手臂随着步伐的来回摆动则能给你向前的动力。
2
Trunk capacity of the largest, the most wide: bold key than the calf, as it should be reactive with the lower leg and foot, and the small intestine can be as long as a drive pin.
躯干的容量最大，所以最宽：大胆比小腿钥，因为它要带功小腿和脚，而小肠只要带动脚就可以了。
3
Base on elucidating the meaning of "curl leg-drive technique" and the hip-drive , the article analysis the linkage between the two chiefly from the physical view .