Torso Rotation
Torso Rotation is a lying stretch performed on a stability ball, where you rock your knees side to side to rotate through your midsection. It loosens the abdominals and the lower back through gentle, controlled rotation.
Why it works
Lying with your back supported on the ball and your feet planted lets you rotate your hips and knees from side to side while your shoulders stay anchored against the ball's curve. That separation between your lower body rotating and your upper body staying still is what stretches the abdominal muscles along their diagonal fibers, the same way a standing trunk twist would, but with your spine supported instead of bearing your full bodyweight.
Set up
- Lie back on a stability ball so your head, neck, and shoulders are supported and your hips are just off the ball.
- Plant your feet flat on the floor, knees bent at roughly 90 degrees.
- Keep your arms relaxed at your sides or lightly braced on the ball.
How to do it
- Keeping your upper back on the ball, slowly rotate your knees to one side.
- Go only as far as feels like a comfortable stretch, not to the floor if that strains anything.
- Pause briefly at the end of the rotation.
- Rotate your knees back through center and continue to the other side.
- Keep the movement slow and controlled for the full set.
Form cues
- Keep your shoulders anchored on the ball; only your hips and knees rotate.
- Move slowly instead of swinging your knees side to side.
- Stop the rotation at a comfortable range, not at your maximum twist.
- Keep your feet flat and stable so the ball doesn't roll out from under you.
Breathing: Exhale as you rotate to one side, inhale as you return through center, then repeat the pattern on the other side.
Common mistakes
Letting the shoulders lift off the ball to chase a bigger rotation.
Fix: Keep the upper back pressed into the ball and let the rotation come from the hips and knees only.
Swinging the knees quickly from side to side.
Fix: Slow the movement down and pause briefly at the end range on each side.
Using a ball that's too small or underinflated, which makes the position unstable.
Fix: Use a properly sized, firm stability ball so your upper back has solid support.
How to program it
- A light mobility drill like this is safe for daily use, or two to three times a week as part of a warm-up.
- Do 8 to 12 slow, controlled rotations per side.
- Works well as a cooldown after rotational sports or lifting, or as a warm-up before core work.
Safety notes
- Keep the rotation range comfortable; this is a mobility drill, not a stretch to push through discomfort.
- Make sure the ball is stable and on a non-slip surface before you lie back on it.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Stretching
Frequently asked questions
How many Torso Rotations should I do?
Aim for 8 to 12 slow, controlled rotations per side, done once or twice through.
Can I do Torso Rotation without a stability ball?
Yes, a standing or lying trunk twist on the floor stretches the same abdominal muscles if you don't have a ball handy.
Is Torso Rotation a core strengthening exercise?
No, it's a mobility and stretching drill. The ball supports your spine while your hips rotate, so the goal is loosening the midsection rather than building strength.
Why does my ball keep rolling during this exercise?
Make sure your feet are planted flat and stable and the ball is properly inflated; an underinflated or oversized ball makes the position harder to control.