Rectus abdominus is one mucsle, not two. It does however contract both ways (top to bottom and bottom to top) so it is important to do things from both sides (ie sit ups and leg raises). The lower portion of the rectus is les superficial where as the upper portion is much closer to the skin allowing it to be more visible. Want to see the lower part?? DIET. Why is it neccessary to have more than one exercise? Like anything, to prevent adaptation also, some exercises will work your obliques more etc.....



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