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Balance
Balance

90/90 Hip Switch

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mobilityhip-mobility90-90internal-rotationexternal-rotationneuromotor

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Exercise demo
Optional deep dive 2 of 12 in Application · Move BetterNext: Hip Circles →
In one line

Sit with both knees bent to 90° (one in front, one to the side) and rotate side to side between positions — a focused drill for hip internal and external rotation.

Detail

Sit on the floor with one leg in front, hip externally rotated and knee bent ~90° (shin roughly perpendicular to the body), and the other leg out to the side, hip internally rotated and knee bent ~90°. This is the 90/90 position. To perform the switch, lift both knees and rotate the hips to bring the legs to the mirror-image position on the other side, lowering both knees down. Continue switching side to side.

The drill trains active hip internal and external rotation (The Hip Complex, Hip Lateral Rotators (6 Short Muscles)) — ranges often restricted by prolonged sitting. The hip is a mobility joint in the joint-by-joint scheme (Stability vs Mobility (Joint-by-Joint Approach)), and limited hip rotation pushes compensatory motion onto the lumbar spine and knees. It develops active mobility (Mobility vs Flexibility) and appears in warm-ups and mobility flows (see Dynamic Warm-Up (Mobility-as-Training)).

Coaching:

  • Sit tall with a long spine; hinge forward over the front shin to deepen if desired.
  • Work within a pain-free range and let it improve over reps/sessions; do not force the knees down.
  • Typical dose: ~6–10 switches (each side), or hold each position briefly.
  • For a single-joint maximal-control version of hip rotation, see hip CARs (Hip CARs (Controlled Articular Rotations)).

Key facts

  • 90/90 seated position (front leg externally rotated, side leg internally rotated, both knees ~90°); rotate side to side.
  • Trains active hip internal and external rotation.
  • Hip = mobility joint; poor rotation loads the lumbar spine/knees.
  • Sit tall, pain-free range, don't force; ~6–10 switches.

Connections

Sources

Cited in text — not yet linked
Authored from established hip-mobility consensus.

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Explore related topics

Atlas Connections

The Hip Complex
The musculature spanning the hip — including the iliopsoas, tensor fasciae latae, sartorius and the iliotibial band — that flexes, extends, adducts, abducts, and rotates the hip.
Hip Lateral Rotators (6 Short Muscles)
Six short muscles produce lateral (outward) rotation of the hip.
Dynamic Warm-Up (Mobility-as-Training)Closely related
A pre-activity routine of active, moving drills that take joints through increasing range while raising temperature and priming the nervous system — building usable mobility, unlike a static hold-and-relax stretch.
Hip CARs (Controlled Articular Rotations)Closely related
Standing tall and braced, trace the largest controlled circle one hip can make — lifting the knee, opening it out, rotating, and reversing — for active hip mobility and joint health.
Mobility vs FlexibilityClosely related
Flexibility is how far a joint can be moved, often with outside help. Mobility is how much of that range you can reach and control with your own muscles. Build both by stretching and by strengthening through full range.
Stability vs Mobility (Joint-by-Joint Approach)Closely related
Joints alternate in their primary need — some want mobility (move freely), some want stability (resist unwanted motion) — and dysfunction at one tends to show up as pain or compensation at its neighbors.