回复：体质虚弱的中年人，只要努力锻炼，还是可以有脱胎换骨般的变化

Do you have problem with your knees? I always have this problem and thus I am unable to jog for a long time that limited my exercise a lot.

所有跟帖： 

• I never have any problem with my knee. -二泉映月09- ♂ (120 bytes) () 07/16/2010 postreply 07:10:51

• 的确如此，控制体重是关键 -3sporter- ♂ (0 bytes) () 07/16/2010 postreply 16:02:17

• 别放弃，自行车和游泳对Knee冲击小，建议试试 -3sporter- ♂ (0 bytes) () 07/16/2010 postreply 16:05:44