Stability Ball Body Saw (How To, Benefits, Muscles Worked)

The Stability Ball Body Saw is an advanced core stability exercise that challenges the abs, shoulders, and hips through dynamic tension.

By holding a plank position with your forearms on a stability ball and rocking your body forward and back, you increase core engagement and shoulder stability while training your body to resist extension.

Primary Muscles Worked: Rectus Abdominis, Transverse Abdominis
Secondary Muscles Worked: Shoulders, Hip Flexors, Glutes (stabilization)
Equipment Needed: Stability Ball

How To Do Stability Ball Body Saws

Step-by-Step Instructions

Set-Up:
- Place your forearms on a stability ball and extend your legs straight behind you into a plank position.
- Keep your body in a straight line from head to heels, core braced, and glutes engaged.
- Shoulders should be stacked over your elbows.
Execution:
- Gently push your body backward by extending through your shoulders and allowing the ball to roll slightly forward.
- Move only as far as you can while maintaining a neutral spine, don’t let your lower back sag.
- Pull yourself back to the starting position by engaging your abs and shoulders.
- Continue rocking back and forth in a controlled, steady rhythm.
Tips for Proper Form:
- Keep your hips level, avoid lifting or dropping them.
- Engage your core before each movement to stabilize the spine.
- Move slowly; small, controlled motions are more effective than large swings.

Key Benefits

Strengthens deep core stabilizers and improves anti-extension strength.
Enhances shoulder and hip stability.
Improves control and tension under movement, great for athletes and lifters.
Builds a stronger, more resilient midsection for performance and injury prevention.

Modifications and Variations

Easier Option:
- Perform the movement on your knees for reduced intensity.
- Limit the range of motion to maintain control.
Harder Option:
- Roll the ball farther forward for a greater challenge.
- Add a slow tempo (2–3 seconds each direction).
- Combine with a stability ball plank hold or pike for added difficulty.

Common Mistakes

Arching the Lower Back: Maintain a strong, neutral spine (don’t let your hips drop).
Moving Too Fast: Slow, controlled movements keep tension where it belongs.
Shrugging Shoulders: Keep shoulders down and stable throughout.
Rolling Too Far Forward: Only move within a range you can control with proper form.

Reps and Sets Recommendations

For Core Strength: 3–4 sets of 8–10 controlled forward-back motions.
For Endurance/Stability: 3–4 sets of 12–15 slow reps.
As a Finisher: 2–3 sets of 20–30 seconds continuous movement.

Stability Ball Body Saw Alternatives

Need an alternative for Stability Ball Body Saws? Whether you don’t have a stability ball or you just want something a little different, here are a few exercises that you may be able to use as a replacement.

Stir The Pot

Honestly, Stir the Pot is probably more of a variation than it is an outright alternative. Stir the Pot is a very similar exercise also done on a stability ball from a plank position.

Instead of simply going back and forth, Stir The Pot has the lifter move their forearms in a circular fashion. In my opinion, this is a bit more challenging and a great alternative for someone who wants a little extra difficulty.

Shoulder Taps

Shoulder Taps are another plank variation, but one that doesn’t need a stability ball.

Shoulder Taps involve holding a push-up plank position and then simply tapping the opposite shoulder with the opposite hand. Alternating back and forth while maintaining a plank position improves both core and shoulder stability.