Core exercises with a fitness ball

Core exercises strengthen abs and other core muscles

Core exercises strengthen your core muscles, including abs, back and pelvis. You can do many core exercises with a fitness ball, also called a stability ball.

Fitness balls come in various sizes. For most exercises, you'll want a ball that allows your knees to be at a right angle when you sit on the ball with your feet on the floor. The firmer the ball, the more difficult the exercise will be.

Do each core exercise five times. Breathe freely and deeply during each exercise. Focus on tightening your deepest abdominal muscle — the transversus abdominis — during each exercise. This is the muscle you feel contracting when you cough. As you get stronger, gradually increase to 10 to 15 repetitions.

Squat and reach

Squat and reach with the fitness ball:

• Hold the ball in front of you and bend your knees. Keep your back straight and your arms parallel to the floor (A). Don't let your knees extend beyond your feet.
• Tighten your abdominal muscles.
• Rotate your trunk and reach with the ball toward your left (B). Hold for three deep breaths.
• Return to the start position and repeat to the right.
• Vary the exercise by holding the ball in a downward position (C) or an upward position (D).