That's 1 rep. Why it rocks: Kneeling medicine ball slams are an awesome exercise that develop rotational core strength. That skill is important for everyday functional movements, says Stewart.

why not try something new with Pilates ball exercises? The stability ball adds more challenge, which can help to engage your core muscles more deeply while improving your balance and posture.

"This quick five-minute deep core workout is all you need, and we’re keeping it simple with just a Pilates ball." How to do ...

If you’re trying to fix that nagging back pain—or more importantly prevent it—try the following strength exercises ... on a stability ball with feet resting on floor and core engaged so ...

Core exercises like side planks, hollow holds, and straight leg-toe touches can help tone your abs. Reducing belly fat can be challenging because the volume of belly fat is heavily dependent on diet.