In Exercise Ball: What part of the body do push ups improve the most? [Archive

What part of the body do push ups improve the most? [Archive] - MacRumors Forums I'm trying to get a firmer/more tight chest. Are p'ups good for that??? Also, what's better to flatten/tighten your midsection - Cardio (running) or sit ups??????? I don't know how to do crunches. yep...its among the best things you can do for your chest. it also works arms and can actually work the abs (to a lesser d ...Exercise Ball