Don't just walk by your stability ball! It's one of the best fitness tools you can own, so put yours to good use with these incredibly effective moves. Get ready to target your arms, abs, butt, and legs — you'll definitely be sore tomorrow.
Doing lunges with your back leg resting on a ball offers the instability you need to make your lower body work even more. Place the top of your left foot on the ball. Keep your right knee soft — do not lock your standing knee. Reach your arms forward at