This video explains Seated Knee Internal Rotation (IR) PAILs/RAILs - a drill designed to improve knee rotation capacity and teach you to own internal rotation with strength, not just “access it” passively. Knee rotation tolerance matters because real movement isn’t perfectly straight: cutting, pivoting, running stride mechanics, squatting mechanics, and even daily turns all involve some degree of rotation through the lower limb. When your knee can’t tolerate rotation, the body often compensates (hip, ankle/foot, or lumbar spine), which can increase irritation over time. This drill helps you build better control and confidence in rotational positions.

The sequence (repeatable for sets or reps):
1. Passive stretch (~2 minutes): settle into the seated knee IR setup and breathe, allowing the tissues and joint to adapt while you find your best alignment.
2. PAILs (progressive isometric contraction): gradually ramp tension into the position to create the stimulus for the day (don’t jump straight to max effort).
3. RAILs (regressive isometric contraction): reverse the intent and actively pull into the newly available range with controlled effort.
4. Sink into the new range: ease off slightly and let yourself settle into the position you just earned.
5. Repeat for additional rounds if you’re doing multiple sets.

Programming note: The iso durations and intensity (time under tension) should match the goal of the day - lighter/shorter for prep and patterning, heavier/longer for strength and adaptation.