Anti-extension plank with hip extension under load. Lifting a foot in plank removes one point of contact, forcing the core to resist rotation AND extension simultaneously. Core stability under asymmetric load — the most functional core pattern.
- High plank position — hands under shoulders, body in a straight line.
- Exhale: lift RIGHT foot 6 inches off floor. Hold 3 seconds.
- Inhale: set it down. Exhale: lift LEFT foot. Hold 3 seconds.
- 10 per side. Hips stay level and still — no rocking, no rotating.
Breath cue: "Exhale to lift, hold and breathe, inhale to set down." The 3-second hold is where the anti-rotation challenge lives.
Should feel: Entire core bracing, especially the side opposite the lifted leg. Glute of the lifted leg engaging.
If hips rock side to side: narrow your stance slightly. The goal is stillness in the trunk while the leg moves.