The stability ball hip crossover increases rotational strength of the midsection. The exercise targets the core, hips, and lower back while also improving balance and stability.

Lie flat on back with arms outstretched to your sides. Bend your knees to 90 degrees and prop your lower legs on the ball.

Exhale and gently roll your legs to one side in a controlled manner. Pause, and then slowly roll to the opposite side as you inhale.

Repeat.