You might feel silly but sitting on a fitness ball instead of a chair when you watch telly will help tone up your belly.
也许你觉得这样做有点傻，竟然坐在一个减肥球上而不是日常坐惯的椅子上来看电视；
You might feel silly but sitting on a fitness ball instead of a chair when you watch telly will help tone up your belly.
也许你觉得这样做有点傻，竟然坐在一个减肥球上而不是日常坐惯的椅子上来看电视；
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