4. The reverse curl 弯身仰举

If you find sit-ups difficult try the reverse curl instead, it's just as effective but easier on the back. Start by lying on the floor, with your hands by your sides. Lift your bum off the floor using just your stomach muscles and keep your arms and shoulders on the floor. Hold for a few seconds then lower yourself back to the floor. Repeat 15-20 times.

如果你觉得做仰卧起坐有困难，那就改做弯身运动吧，这同样有效，并且还更简单易做。仰卧于地板上，把双手放在身体两侧。只用你的腹部肌肉把臀部提起离开地面，同时要把双臂和肩膀贴在地板上。保持这样的姿势几秒钟，然后轻轻把身体落回地面。这样重复15-20分钟。