Position a stability ball between a wall and your lower back. Maintaining an engaged core, squat down and stand with your feet shoulder-width apart.
With your hands on a stability ball and your legs extended back, stand like a plank. As you bring your chest back up to meet the ball, make sure your arms and core are working.
With your hands resting on a stability ball, stretch your legs into a plank. While maintaining a rigid and stable core, alternately bring your knees to your chest while running.
Set up your feet flat on a stability ball and increase the dumbbells above your chest. As you lower the weights to the sides, keep your chest and core engaged. Then, press back up.
Place your feet on a stability ball and lie on your back. Squeeze your glutes as you raise your hips toward the ceiling and then lower them back down while keeping your core engaged.
Shins on the stability ball once you begin in a plank position. Bending at the knees, roll the ball towards your chest and then extend your legs back to the beginning position.