2A Swiss-Ball Leg Curl
Reps: 15 Tempo: 321 Rest: 60 Seconds
Lie on your back on the floor and rest your heels on a Swiss ball. Drive your heels into the ball so that your hips come up in the air . Now, keeping your hips elevated, bend your knees so that the ball rolls toward you . Straighten your knees again. That's one rep.