90/90 hip stretch: step-by-step guide
The 90/90 stretch loads both internal and external hip rotation simultaneously - the only stretch that does this. Used by elite physiotherapists and sports medicine practitioners worldwide as a hip mobility assessment and treatment tool.
90/90 hip stretch - seated with both legs bent to 90 degrees in opposite directions
Video/GIF illustration - Phase 2
Why the 90/90 is uniquely valuable
Most hip mobility exercises focus on either flexion-extension (kneeling lunge, pigeon) or one direction of rotation. The 90/90 is the only position that simultaneously stretches internal hip rotation in the front leg and external hip rotation in the back leg. This bilateral loading reveals asymmetries between left and right hips that other stretches miss.
The position comes from Functional Range Conditioning (FRC), a mobility system developed by Dr. Andreo Spina that has been adopted widely in physiotherapy and elite sports. In FRC, the 90/90 is the foundational hip assessment: inability to sit upright in the position, or significant asymmetry between sides, indicates hip rotation restriction that is a risk factor for lower back and knee injury.
Step-by-step instructions
Sit on the floor. Bend your right leg to 90 degrees in front of you, with the right shin roughly parallel to the front of your mat.
Bend your left leg to 90 degrees to your left side. The left knee points to the left, the left foot points back.
Both knees are at 90-degree angles - but in opposite directions. The front leg is in external rotation; the back leg is in internal rotation (relative to each hip joint).
Sit as tall as possible. Do not round the lower back. If you cannot sit upright, lean back slightly on your hands.
Hold 30-45 seconds. You will feel different sensations in each hip - this asymmetry is information.
Switch legs (back leg becomes front leg) and hold again. The second side will likely feel different.
Reading your asymmetry
Front leg tightness
The front hip is in external rotation. Tightness here - felt as groin strain or inner-thigh pulling - indicates restricted hip external rotation. Common in people who internally rotate habitually (knock-kneed posture, over-pronators).
Back leg tightness
The back hip is in internal rotation. Tightness here - felt as outer hip pain or resistance at the back of the hip - indicates restricted hip internal rotation. Very common in desk workers and runners. Linked to lower back pain and IT band issues.
Common mistakes
Rounding the lower back neutralises the hip position and reduces the stretch. Either sit tall (use your hands behind you if needed) or place a yoga block under the back hip to support it.
One or both hips may not be able to reach the floor - this is normal for beginners. Use a folded blanket under the elevated hip rather than forcing it down.
The 90/90 takes weeks to months to develop. Forcing hip rotation beyond current range does not produce faster gains and may strain the hip capsule ligaments. Work at 70-80% of your maximum range.
Modifications
Easier
- Lean back on both hands for lower back support
- Place folded blankets under both hips
- Reduce both angles to 70 degrees if 90 is too much
Harder - Active mobility work
- With torso upright, slowly lower to touch front-leg side with your elbow
- Add a "windshield wiper" movement - rotate both knees toward the centre and back
- Add isometric holds: press foot into floor for 5s, then release
Contraindications
- Hip labral tear: some positions in the 90/90 may impinge the labrum - seek a physiotherapist assessment for a safe version
- Groin strain: the adductors are loaded in the external rotation component - avoid in acute groin injury
- SI joint dysfunction: the 90/90 position creates asymmetric load through the pelvis - may be inappropriate in acute SI joint pain
Evidence note
Research on hip mobility in athletes links restricted internal hip rotation with increased lower back injury risk (Leetun et al., 2004, Medicine & Science in Sports & Exercise). The 90/90 is used as a clinical assessment for hip rotation in multiple published physiotherapy protocols. Functional Range Conditioning research shows improvements in hip rotation range of 15-25% after 8 weeks of regular 90/90 practice (Spina, 2010).