Overview

The knee-to-chest stretch is a gentle lying stretch for a stiff or achy lower back. It lets the back relax into a rounded position without loading it, which makes it a comfortable early stretch for many people.

It is a gentle movement, not a test. If it reproduces leg pain, numbness or sharp back pain, stop and get the back assessed.

Stretch Name

Knee-to-Chest Stretch

Primary Purpose

Gently mobilize the lower back and pelvic area
Ease stiffness after sitting or standing for long periods
Relax the muscles beside the spine

Target Muscles

The paraspinal muscles alongside the lower spine
The gluteal muscles at the back of the hip

Difficulty Level

Beginner

Step-by-Step Instructions

Lie on your back with both knees bent and feet flat on the floor.
Bring one knee toward your chest and hold it with both hands.
Hold for 20–30 seconds, breathing normally.
Lower the leg slowly and repeat on the other side.
For a deeper version, bring both knees toward the chest together and hold.
Repeat 2–3 times per side.

What You Should Feel

A mild stretch or release in the lower back and buttock. Stop if you feel sharp back pain, leg pain, numbness or tingling.

Common Mistakes

Holding the breath while stretching
Pulling the knee so hard that the hip or back feels pinched
Rocking or bouncing into the stretch
Doing this stretch to "work through" acute leg-dominant pain

Easier Alternatives

Keep the other leg bent with the foot flat instead of straight
Hold the knee with a towel looped behind the thigh
Rock the knee gently side to side instead of pulling it in hard

Progressions

Hold both knees to the chest for a longer stretch
Add a gentle side-to-side roll while both knees are held
Follow with comfortable back mobility — see the cat-cow stretch

Who Should Avoid This

Do not stretch through leg-dominant pain, numbness or weakness. If you have changes in bladder or bowel function, saddle numbness or weakness in both legs, seek urgent care rather than stretching.

References

NICE. "Low back pain and sciatica in over 16s: assessment and management." NG59. 2016 (updated 2020). https://www.nice.org.uk/guidance/ng59
NHS. "Back pain." https://www.nhs.uk/content-widgets/health-a-to-z/back-pain

This information is for education only and is not a medical diagnosis. InjuryAtlas does not replace an assessment by a qualified health professional. If you have severe pain, visible deformity, numbness, loss of function, or symptoms that are getting worse, seek medical care promptly.