Variable UPPERCUT_ANIMATIONConst

Uppercut - 어퍼컷 (상승권 - Sangseung Gwon / 올려치기 - Ollyeochigi)

Rising punch targeting chin from below using leg drive and upward hip thrust. Devastating close-range knockout technique generating power from ground through vertical chain.

Korean Martial Arts Biomechanics (한국 무술 생체역학):

Stance & Weight Distribution (자세와 체중 분배):

• Start: 60/40 weight distribution
• Crouch: Weight shifts to 65/35 on striking side (loading)
• Impact: 70/30 - full commitment to vertical drive
• Stance width: SLIGHTLY WIDER for stable base during crouch

Crouch/Chamber Phase - 낮추기 (Najchugi) [150ms]:

• Body: Drops CENTER OF GRAVITY by ~10-15cm (무게중심 낮추기)
• Striking leg: Knee bends DEEPER ~100° (1.75 rad) - loading spring
• Hip: Tilts backward and DOWN on striking side (~15° pelvic tilt)
• Striking fist: Drops to hip level, palm facing INWARD/UPWARD (손바닥 위로)
• Elbow: Bent ~110° (1.92 rad), close to ribs
• Rear hand: Maintains 중단막기 (chin protection) - critical for counters
• Shoulders: Dip slightly on striking side (~10° drop)
• Breathing: Quick inhale while loading (준비 호흡)
• Weight: Loads onto ball of striking-side foot

Drive/Explosion Phase - 상승 (Sangseung) [200ms]:

• Legs: EXPLOSIVE EXTENSION - knee straightens from 100° → 170° (0.18 rad)
• Hip thrust: Drives UPWARD and FORWARD (~20° upward angle)
• Power chain: Ground → Legs → Hips → Core → Shoulder → Fist (VERTICAL)
• Heel: Lifts off ground as leg extends
• Pelvis: Thrusts upward and forward, creating hip drive
• Torso: Rises with hip drive, slight forward lean (~10°)
• Striking shoulder: Begins upward drive
• Fist: Starts vertical ascent along CENTERLINE

Strike/Extension Phase - 타격 (Tagyeok) [100ms]:

• Fist: Rises in VERTICAL PATH from hip to chin level
• Fist rotation: Inward palm → Neutral/Pronated (90° rotation)
• Elbow: Remains bent ~120° (2.09 rad) throughout - NOT straight punch!
• Trajectory: Fist travels UPWARD at ~60-70° angle from horizontal
• Shoulder: Completes upward drive, elevating ~15cm
• Hip: Full upward thrust completed
• Legs: Fully extended, body at maximum height
• Breathing: EXPLOSIVE exhale "우억!" (Wueok!) - rising kihap

Peak Impact - 정점 (Jeongjeom) [100ms]:

• Target: 턱 (chin) from BELOW - ideal knockout angle
• Impact surface: Knuckles facing UPWARD, hitting underside of jaw
• Body position: Full vertical extension, heel off ground
• Power delivery: ALL body mass driving UPWARD into target
• Neck snap: Opponent's head snaps BACKWARD and UP (knockout mechanism)
• Weight: 70/30 forward, committed to strike
• Rear hand: STILL protecting (never drops!)

Retraction Phase - 회수 (Hoisu) [150ms]:

• Fist: Drops back toward hip via same path
• Body: Begins lowering back to normal height
• Legs: Bend slightly to absorb return motion
• Hip: Settles back to neutral pelvic alignment
• Heel: Returns to ground

Recovery Phase - 복귀 (Bokgwi) [200ms]:

• Return to 중단막기 (middle guard) bilateral protection
• Center of gravity: Returns to normal fighting height
• Weight: Resets to 60/40 distribution
• Stance: 겨루기 자세 (fighting stance) restored
• Breathing: Controlled recovery, ready for next technique

Combat Applications (전투 응용):

• Primary target: 턱 (chin/jaw) from below - maximum knockout potential
• Ideal range: CLOSE combat (0.3-0.5m) - too close for straight punches
• Combinations: After body shot brings opponent's hands down
• Counter: When opponent ducks or bends forward
• Liver targeting: Body uppercut to 간장 (liver) at close range

Biomechanical Keys (생체역학 핵심):

1. Leg drive (다리 추진력): 60% of power comes from legs!
2. Hip thrust (엉덩이 밀기): 25% from upward pelvic motion
3. Shoulder lift (어깨 들기): 10% from shoulder elevation
4. Arm (팔): Only 5% - mostly for targeting!

Physics Principle: "상승하는 힘은 중력을 이긴다" (Rising force defeats gravity)

• Vertical strike vector meets horizontal chin = devastating angle
• Opponent's neck structure weakest against upward force
• Body weight + leg extension = maximum vertical power transfer

Common Mistakes (흔한 실수):

• ❌ Arm-only punch (팔만) - No leg drive = weak uppercut
• ❌ Wide arc (넓은 호) - Too telegraphed and slow
• ❌ Straight up (수직) - Needs forward component for power
• ✅ Correct: Deep crouch + explosive leg extension + upward hip thrust

Taekwondo Principle: "땅에서 하늘로" (From Earth to Heaven) The uppercut exemplifies vertical power generation - like jumping!

Total duration: 800ms (HEAVY_LIGHT technique)