5 Ab Excercises for a Beach Ready Body by FitTips4Life - Jul 7, 2014 1. Push Upvia womenshealthmag.com Pushups are the ultimate full body exercise. In addition to working the arms and shoulders, pushups train the core better than any crunch can. If you can’t start with your feet on the ground, you can always begin on your knees. Perform 3 sets of 5.