Is 200 crunches more effective than 200 sit-ups?
Sit-ups emphasize sitting up rather than merely pulling your sternum down to meet your pelvis. The psoas muscles run from the lower back to the front of the thighs. This muscle action is to pull the thighs closer to the torso. This action is the major component of sitting up. Because of this, sit-ups are a pretty useless exercise if you want to get your abs in shape.
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