ConstReadonlyCHAMBER: {Chamber Position (준비자세) - Knee lifted, tight
ReadonlyEXTENSION: {Extension Position (차기자세) - Leg extended with hip drive
Front kick (앞차기) keeps the hips square (정면) — NO Y-rotation. Rotational kicks (돌려차기, 옆차기) own their pelvis Y-rotation via ROUNDHOUSE_CHAMBER / SIDE_CHAMBER instead of this shared phase.
ReadonlyHIGH_PEAK: {High Axe Kick Peak (높은차기) - Leg nearly vertical
Hip flexion clamped to MAX_FLEXION (1.92 rad ~110°) - the previous 2.5 rad exceeded human anatomical range.
ReadonlyROUNDHOUSE_CHAMBER: {Roundhouse Chamber (돌려차기준비) - Hip rotated out
Strong support-foot pivot (pelvisY=-0.78) for authentic Korean dollyeochagi (돌려차기) hip-driven power generation.
ReadonlySIDE_CHAMBER: {Side Kick Lateral (옆차기) - Turned sideways
Body fully bladed: pelvis 90°, spine counter-rotated for foot-edge strike.
Kick phases for proper martial arts execution 발차기 단계별 자세