Want to work your abs with a yoga ball? We turned to an expert to walk you through the best moves to do—and how to do them.

The best medicine ball exercises for building abs Rotating boat pose is a yoga-like exercise that strengthens muscles across your midsection, as well as your chest and hips. It can also be done ...

"This quick five-minute deep core workout is all you need ... For example, you could place the ball behind the small of your ...