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For the back, have you ever tried like this (I don't know what it is called in English, sorry):
Lie face-downward on the floor; two hands meet at the back of head, fingers interlocked; try to lift your upper body (head down to hip) as high as possible while your lower body sticks to the floor; inhale while lifting, exhale when returning to the floor. Try to do it at the same amount of situp.
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