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Hip-flexor PAILs/RAILs (couch-stretch position)

hip flexors, quadriceps · bodyweight, wall or bench for the rear foot

Video thumbnail: Couch Stretch PAIL RAILS TUTORIAL

External video — Couch Stretch PAIL RAILS TUTORIAL by SJC Physiotherapy.

How to do it
Setup
Kneeling lunge: rear knee down, rear foot up against a wall or bench behind you. Front foot flat on the floor, well out in front. Torso tall, ribs stacked directly over your pelvis — not leaning back.
Execution
PAIL: squeeze the rear glute and drive that knee down into the pad, ramping the effort up over 5-10s, hold at peak, release over 5s. RAIL: immediately try to drag the same knee forward off the pad against your own resistance, hold 5-10s. That's one rep. Repeat for the prescribed reps, then switch sides.
Common error
Arching the lower back to lean the hips forward and fake extra range — the stretch has to come from the front of the rear hip, not from your spine. Keep the ribs stacked down over the pelvis the whole time.
Feel
A building stretch through the front of the rear hip/quad during the PAIL, real muscular effort during the RAIL. Dull ache is fine. A sharp pinch in the right hip means back off the depth now, don't push through it.

Rear knee down, rear foot up a wall/bench behind you, front foot flat ahead — PAIL: drive the rear knee into the pad; RAIL: draw the rear knee forward against your own resistance. Dull ache fine; sharp pinch in the right hip = back off the depth now.

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