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.

Discover how strengthening your pelvic floor muscles can improve core stability, posture, and overall fitness with these 7 ...

Lie facedown on the mat with legs extended straight and arms down at sides, palms down. Contract glutes and lower back ...

"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 ...

Research shows that using an exercise ball during the plank exercise can better activate your core muscles than simply being on flat ground or a yoga mat. This is considered a very advanced move ...

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.

Don't know what to do with that medicine ball? Here are 23 of the best medicine ball exercises from a trainer to strengthen upper body, core, and legs.