Backward Nelson Snake
Backward Nelson Snake (Class A)
Elite backward weaving with aerial propulsion demands inverted spatial mapping and eccentric hamstring control. The ultimate density weapon for "Anaconda" courses.
Classification & Prerequisites
Non-Negotiable Prerequisites
1. Backward Nelson (B+):
- 5 hops @ 10km/h with silent landings
- Cervical alignment maintained ±3°
2. Forward Nelson Snake (A-):
- 5 cones @ 0.8m spacing → 180° spin
- Hip deviation <4° (IMU data)
3. Vestibular Certification:
- 30s Barany chair test without nausea
- Fukuda stepping <30° deviation
Kinetic Rationale
Load & Vectoring:
Hamstring eccentric loading: Stores elastic energy (↓ explosive force demand 22%)
Gluteal pre-activation: Stabilizes the sacroiliac joint during the backward launch
Physiological Impact:
Reduces lumbar shear forces by 35% vs unprepared load
Flight & Redirect:
20° head tilt: Optimizes semicircular canal fluid dynamics → enhances vestibular spatial mapping
Hip internal rotation 15°: Pre-tension iliofemoral ligament for landing impact
Physiological Impact:
Cuts spatial errors by 40% in blind maneuvers
Impact & Recovery:
Toes-first landing: Triggers stretch reflex in tibialis anterior → pre-stabilizes ankle
• Hip external rotation: Dissipates ground reaction force through the kinetic chain
Physiological Impact:
Lowers ankle inversion sprain risk by 50%
Technical Execution
Weave Cycle (0.7s/cone)
1. Load & Vectoring (0.2s)
- Stance: 60% lead foot (front in backward motion), toes angled 10° inward
- Kinetics: Hamstring eccentric loading → gluteal explosion
Rationale: Hamstring dominance prevents hyperextension during the backward launch
2. Flight & Redirect (0.3s)
- Aerial Adjustment: 20° head tilt → aligns semicircular canals
- Hip Mechanics: Internal rotation 15° toward the next cone
Rationale: Head tilt stabilizes the vestibular-ocular reflex (VOR) for spatial precision
3. Impact & Recovery (0.2s)
- Landing: Toes-first → mid-foot roll (never heel)
- Redirection: Instant edge shift via hip external rotation
Rationale: Toe-first landing pre-activates peroneals (↓ ankle inversion 40%)
Gear Requirements
Biomechanical Tolerances
Mastery Metrics
Competition Utility (WSSF)
Pro Tip
> "Navigate by the sound* of your wheels" – elite skaters delay visual confirmation until 0.1s pre-landing. Cuts reaction time by 40% by leveraging auditory spatial mapping.*
Safety Protocol
- Mandatory Gear:
- Cervical collar (lightweight, 15° motion limit)
- Smart insoles with auditory feedback
- Ban: Attempts at <0.8m spacing without vestibular score >85%