Single-Leg Stretch

Lie supine and curl the head and shoulders into upper-spinal flexion. Draw one knee toward the chest (hands on the shin) while the other leg extends out at a height the lower back can keep anchored. Switch legs in a controlled, coordinated rhythm, exhaling as a knee draws in. The trunk stays still and braced throughout — the legs move, the powerhouse holds.

Trains anti-rotation/anti-extension core stability and coordination — the limb movement challenges a still trunk (pilates-powerhouse). Keep the lower back anchored (raise the extending leg higher if it lifts off) and the neck long (spine-positioning). Part of the classical "stomach series" with pilates-double-leg-stretch and pilates-criss-cross.

• One knee in, opposite leg extended; alternate with control.
• Trunk stays still; the powerhouse stabilizes against moving limbs.
• Anchor the lumbar spine; raise the extending leg if the back lifts.

• pilates-double-leg-stretch / pilates-criss-cross — same series.
• pilates-powerhouse — trunk stabilization.
• abdominals — primary movers/stabilizers.
• spine-positioning — keep the lumbar anchored.