The ball offers support that makes this move feel easier, plus increases your range of motion, notes Smith. That’s going to help you bend further to more deeply engage the obliques, which cinch in the waist like a corset.
TO DO: From kneeling, drape your left side over the ball and extend your right leg. With hands at your ears, bend at the waist to draw your top elbow toward your hip, then return to start. Do
10 reps; switch sides.