Variable AXE_KICK_ANIMATIONConst

Axe Kick - 내려차기 (Naeryeo Chagi) or 찍기 (Jjikgi)

Spectacular high-reaching kick that descends like an axe blade onto target. Heel (뒤꿈치 - Dwikkumchi) drops vertically from above - devastating when lands!

Korean Martial Arts Biomechanics (한국 무술 생체역학):

Stance & Weight Distribution (자세와 체중 분배):

• Start: 겨루기 자세 (Fighting stance), 60/40
• Rise: 100% weight on supporting leg
• Chop: 100% weight, body leans back for counterbalance
• Recovery: Gradual return to 60/40
• Requires: Excellent flexibility (유연성) and balance (균형)

Rise Phase - 올리기 (Olligi) [200ms]:

• Kicking leg: Lifts STRAIGHT UP in vertical plane
• Hip flexion: MAXIMUM ~120-140° (2.09-2.44 rad) - very high!
• Knee: STRAIGHT or nearly straight 170° (0.18 rad) throughout rise
• Ankle: DORSIFLEXED (발목 굽히기) - heel ready for strike
• Leg path: Vertical rise DIRECTLY in front of body
• Height: Leg rises ABOVE target height (need height to chop down!)
• Supporting leg: Straight 170° (0.18 rad), rock-solid base
• Hips: Slight forward tilt to assist leg rise
• Torso: Slight backward lean ~10° to counterbalance
• Arms: 상단막기 (High guard) protects during extended position
• Head: Looks UP following leg rise, then locks on target
• Breathing: Deep inhale during rise (힘내기)
• Balance: Core TIGHTLY engaged - stability critical
• Supporting heel: May lift slightly to assist height

Apex/Peak Position - 정점 (Jeongjeom) [Brief moment]:

• Leg: At maximum height - ideally ABOVE own head!
• Hip: Fully flexed, leg vertical or beyond
• Body: Backward lean increases to ~15-20°
• Moment of transition: Ascending motion → Descending motion
• Critical: Must maintain balance at apex!

Chop/Descending Phase - 내려치기 (Naeryeochigi) [300ms]:

• Leg: Drops STRAIGHT DOWN in vertical plane - like axe blade!
• Motion: CONTROLLED DROP initially, accelerates with gravity
• Knee: Stays straight ~170° (0.18 rad) - rigid striking lever
• Ankle: Maintains dorsiflexion - heel is blade edge
• Striking surface: 뒤꿈치 (heel) - hardest part descending
• Trajectory: VERTICAL or slightly forward - NOT backward!
• Speed: Accelerates due to gravity + muscle contraction
• Hip: Drives DOWN and FORWARD to add power
• Body: Continues backward lean ~15-20° for balance
• Arms: High guard maintained - face protection
• Breathing: Begin exhale during descent
• Supporting leg: Stays straight and stable
• Eyes: Lock on target during descent

Impact Phase - 타격 (Tagyeok) [120ms]:

• Impact: Heel CHOPS DOWN onto target
• Target zones:
  • 머리 (head/crown) - knockout/concussion
  • 어깨 (shoulder) - collar bone break
  • 쇄골 (clavicle) - structural break
  • 팔 (arm) - limb disable if blocking
• Impact energy: Body weight + gravity + muscle force
• Breathing: EXPLOSIVE exhale "하!" (Ha!) or "척!" (Cheok!)
• Follow-through: Heel continues DOWN past initial contact
• Body: Maximum backward lean ~20-25° at impact
• Supporting leg: Solid base absorbs impact shock
• Power: Downward force = devastating on rigid structures

Set Down Phase - 착지 (Chakji) [150ms]:

• Leg: CONTROLLED descent to floor from impact
• Knee: May bend slightly ~160° (0.28 rad) to cushion landing
• Foot: Places forward in front of body (typical placement)
• Hip: Releases flexion, leg lowers smoothly
• Body: Begins returning to upright position
• Weight: Begins transferring to kicking leg as it lands
• Balance: Smooth transition, no stumbling

Recovery Phase - 복귀 (Bokgwi) [230ms]:

• Stance: Foot now planted forward, weight shifts forward
• Body: Returns to upright fighting posture
• Weight: Settles to 60/40 distribution (may now be in switched stance)
• Hips: Return to neutral square position
• Arms: Return to 중단막기 (middle guard)
• Stance: Reset to 겨루기 자세 (fighting ready)
• Breathing: Controlled recovery breath
• Balance: Full stability restored

Combat Applications (전투 응용):

• Head strike (머리공격): Knockout potential - concussion
• Collar bone (쇄골): Structural break - disabling
• Shoulder (어깨): Joint damage or dislocation
• Breaking guard: Chop down on opponent's blocking arms
• Combinations:
  • 앞차기-내려차기 (Front-Axe) - fake low, go high
  • 내려차기-돌려차기 (Axe-Roundhouse) - vertical to horizontal
  • After grab escape: Leg free → immediate axe kick

Biomechanical Keys (생체역학 핵심):

1. Straight leg rise = Maximum height (bent knee = lower height)
2. Vertical path = Pure downward force (no angle dissipation)
3. Gravity assist = Free energy addition to strike
4. Heel strike = Hardest surface, concentrated force
5. Backward lean = Counterbalance enables high rise and stable descent
6. Flexibility = Determines maximum height and effectiveness

Physics Principle: "중력은 최고의 친구다" (Gravity is your best friend)

• Potential energy (height) → Kinetic energy (descent)
• Acceleration = 9.8 m/s² + muscle contraction
• Vertical impact = No force dissipation to sides
• Heel = Smallest contact area = Maximum PSI

Taekwondo Principle: "내려차기는 태권도의 예술이다" (Axe kick is the art of Taekwondo)

• Most spectacular: Visual impact and difficulty
• Most flexible: Requires extreme hip flexibility
• Most balanced: Perfect balance while extended
• Most surprising: Unexpected attack angle from above

Common Mistakes (흔한 실수):

• ❌ Bent knee rise (구부린 무릎) - Can't reach height
• ❌ Backward trajectory (뒤로 내리기) - Misses target
• ❌ Pointed toes (발끝 펴기) - Wrong striking surface
• ❌ Forward lean (앞으로 기울기) - Loss of balance, falls forward
• ❌ No height (낮은 올리기) - Weak chop, not enough drop
• ❌ Uncontrolled descent (통제 안됨) - Can't stop, miss target
• ✅ Correct: Straight leg high + vertical chop + controlled descent + heel strike

Training Points (훈련 포인트):

• Flexibility first: Can't axe kick without hamstring flexibility!
• Height practice: Kick high first, accuracy second
• Balance work: Single-leg balance drills essential
• Controlled descent: Not just dropping - DRIVING down
• Landing practice: Smooth set-down without stumbling

Flexibility Requirements (유연성 요구사항):

• Hamstring: Must reach 160-180° hip flexion
• Hip flexors: Must support leg at high position
• Lower back: Must tolerate backward lean
• Standing leg: Calf flexibility for supporting heel lift

Competition vs. Street (겨루기 vs. 실전):

• Competition: Spectacular, high-scoring technique
• Street: RISKY - high commitment, long recovery if miss
• Demo: Flashy, breaks boards held high
• Practical: Best when opponent's guard is high

Total duration: 1000ms (HEAVY technique)