1楼frankieyuan
(这个世界呀……)
发表于 2009-6-16 11:42
显示全部帖子
Well I don't think it's an efficient way to walk for exercises. Skipping ropes works well, and a plan could be important. You need to increase the number(times of skipping)regularly, and a stair-like plan like this does help in many situations..