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Lying knee rock for lower back: how to do it
The lying knee rock is a slow, small movement for the lower back and hips. You lie on your back with your knees bent and let both knees sway gently from side to side while your shoulders stay on the floor. It is a mobility move, not a hard stretch.
People often use it as a warm-up before other exercises or to loosen up after a long time sitting. It is not a cure for back pain on its own. Guidelines for low back pain recommend staying active and doing regular exercise, and an easy movement like this is a low-effort way to start.
How to do it
- Lie on your back with your knees bent and feet flat.
- Keeping your shoulders on the floor, let both knees fall gently to the right.
- Bring them back and let them fall to the left.
Dose: about 8 slow reps.
Tip: Move slowly and only as far as feels comfortable.
Common mistakes
- Dropping the knees too far or too fast. Small, slow swings are enough.
- Lifting a shoulder off the floor. Keep both shoulders relaxed and down.
- Holding your breath. Breathe out as the knees fall to the side.
- Pushing into pain. Reduce the range or stop.
Easier options
- Make the movement smaller, rocking only a few centimetres each way.
- Place a pillow under each knee to support them.
- If it is uncomfortable, lie on your back and hug one knee at a time toward your chest instead.
This matches the Lying Knee Rock exercise in the Mo app.
When to stop and see a professional
Stop and speak to a doctor or physiotherapist if you notice:
- numbness, tingling or weakness in a leg or foot
- pain that spreads (radiates) down a leg
- pain that started after an accident, fall or other injury
- loss of bladder or bowel control, or numbness between your legs (seek emergency care)
- pain that keeps getting worse, wakes you at night, or comes with fever or unexplained weight loss
If the movement causes sharp pain in your back or hips, stop and try the knee-to-chest or cat-cow guide instead.
Do this with Mo, a 5-minute guided routine app
Mo the sloth guides short daily posture, neck and back exercises, with gentle reminders and a pain check-in. Learn more about Mo.
Related guides
- Knee-to-chest stretch for lower back
- Cat-cow stretch for lower back stiffness
- Child's pose for lower back
- Lower back pain from sitting: 3 gentle floor moves
- Glute bridge for lower back
- Pelvic tilt
- Mo: Posture & Back Pain Relief app