The Ab Crossover (aka the Ab Chopper) is a great way to work your abs while working your shoulders a little bit too. It's a good alternative to boring old crunches so try it out. Here's how: Lie on your back with your knees bent and hands straight overhead, clasped together. Crunch up (contract your abs) while bringing your hands over to the outside of your left thigh. That's is one rep. Lower Read more