"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you're looking for an exercise that will amp up your abs routine, look no further. The Russian twist ...

Start in a seated position with your legs slightly bent. Hold the medicine ball at your abdomen. While holding the medicine ball, rotate your torso from side to side. Beginner — Start with 10-12 reps, ...

Sit with your legs bent at 45 degrees, lift your feet off the floor and keep your spine long and straight and lean back. Hold your medicine ball in both hands and extend your arms in front of you.

Ready for some good news? This one workout can help you lose weight and tone your abs even when done while sitting. Russian ...