Hey...I'm a 13 year old kid, I weigh about 155-160 pounds(changes every few days) and I'm 5'8. I've been searching and searching everywhere for some tips on what to do to get ME in shape, considering I'm 13. I'm not completely out of shape, and not too much flab on the stomach. I'm looking for a good schedule that I'd be able to keep. The one I have now is 12 sets of 50 reps doing sit ups. That's just way too much for me, but I've been able to do it for about a week, and after that, i just didn't have the time, nor the 'drive' to do it...So i'm looking for tips on how to build up some abs..Any and all help would be appreciated.