1. Place an exercise ball between your back and the wall, then squeeze it with your back muscles.
2. Slowly lower your body until your knees bend, as if sitting down, then slowly stand back up.
Seated Arm Exercise
1. Sit on a fitness ball with elbows bent, holding a dumbbell in each hand.
2. Raise the dumbbells to shoulder height, then lower them.
Pelvic Balance
1. Get on all fours, then slowly extend one arm forward.
2. Simultaneously extend the opposite leg backward, lifting it to hip height.
3. Point your toes downward. Hold for 10 seconds, then switch legs and arms to repeat.