7. Crunch and twist 继续做仰卧起坐并且扭动身体

Once you've been doing sit-ups for a while you'll notice that they've become a lot easier, don't give up and don't just do more, do them differently instead. Keep your hands by your ears and raise yourself up slowly then twist your body--from the waist, not your back or shoulders--and try to touch your knees with your opposite elbow, i.e. your right elbow comes up and across to touch your left knee. Untwist and go back to your starting position. Repeat on each side 10-15 times.

一旦做仰卧起坐坚持一段时间，你就会发现做起来简单多了，不要放弃也不要做得更多，而是换种方式来做。保持你的双手在耳侧，慢慢把身体抬起来，然后，弯曲你的身体——从腰开始，而不是从你的背部或者肩膀-试着用相反方向的胳膊肘去够你的膝盖，如此这般，用你的右肘去够你的左膝。松开还原到你原来的姿势。重复做，一边坚持10-15次。