Exercise guide
Kettlebell Overhead Crunch On Stability Ball
- Intermediate
- Compound
- Rep-based
- Waist
This advanced core exercise combines the instability of a stability ball with the increased leverage of an overhead load to maximize rectus abdominis and oblique recruitment. It forces the core to stabilize the spine against a shifting base while resisting the downward pull of the kettlebell.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit on the stability ball and walk your feet forward until your lower back is firmly supported by the curve of the ball.
- Hold a kettlebell by the horns (sides of the handle) with both hands and press it directly over your chest.
- Plant your feet flat on the floor, hip-width apart, and ensure your thighs are parallel to the ground.
- Extend your arms fully so the kettlebell is positioned toward the ceiling.
How to do it
- Inhale to prepare, then exhale as you contract your abs to lift your shoulder blades off the ball.
- Keep the kettlebell reaching vertically toward the ceiling throughout the entire movement, rather than moving it forward toward your knees.
- Pause at the top of the movement for a one-second peak contraction, squeezing your ribs toward your hips.
- Slowly lower your upper back to the ball over a 2-3 second count while inhaling, maintaining tension in the core.
Form checklist
- Keep the kettlebell path strictly vertical (reaching for the ceiling).
- Avoid tucking your chin to your chest; keep a space the size of an orange under your chin.
- Ensure your hips remain still and do not bounce on the ball to create momentum.
- Press your lower back into the ball throughout the movement to protect the lumbar spine.
Pro tips
- Focus on 'shortening' the distance between your sternum and your belly button to ensure the abs are doing the work rather than the hip flexors.
- For maximum tension, do not let your shoulder blades fully rest on the ball at the bottom of the rep; keep the core engaged throughout the set.
Make it harder
- Narrow your foot stance to a single point of contact to significantly increase the stability demand on the obliques.
- Increase the range of motion by allowing your spine to slightly extend over the curve of the ball at the bottom of the rep before crunching back up.
Frequently asked
- What muscles does the kettlebell overhead crunch on stability ball work?
- The kettlebell overhead crunch on stability ball primarily targets the abs and obliques, and also works the erector spinae as secondary muscles.
- What equipment do you need for the kettlebell overhead crunch on stability ball?
- The kettlebell overhead crunch on stability ball uses kettlebell.
- Is the kettlebell overhead crunch on stability ball good for beginners?
- The kettlebell overhead crunch on stability ball is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.