# Conditioning drills — grafted from snowboarding

**Why snowboarding.** David's observation, 2026-08-28: every shuffle contact is **toe / heel / flat**,
and snowboarding is *entirely* toe-edge versus heel-edge. The sports share an ankle problem, so the
sport with a mature training literature can lend drills to the one with none.

That is the Fei Kune Do move — graft from a system that solved the same mechanical problem — applied
to conditioning rather than technique.

## The mapping

| shuffle demand | snowboard equivalent | what it trains |
|---|---|---|
| **toe landing / ball contact** (Basic Running Man) | holding a **toe edge** | gastrocnemius, soleus |
| **heel landing** (Light Running Man) | holding a **heel edge** | **tibialis anterior** |
| **heel-toe pivot** (T-Step, Heel Toe Travel) | **edge transition** | ankle inversion/eversion under load |
| single-leg support through the cycle | one-footed riding / skating | ankle proprioception |
| hop variations (V-Step Hop) | ollie / landing absorption | plyometric tolerance |

**The T-Step *is* an edge transition.** Heel-toe pivot on a loaded foot is the same movement a
snowboarder makes turning, minus the board. That is not an analogy — it is the same ankle action.

## Drills

### 1. Heel walks — for the heel edge / heel landing
Walk on heels, toes lifted clear, 20–30m. Targets **tibialis anterior**, the muscle almost nobody
trains and the one that holds a heel contact without collapsing to flat.
*Snowboard source: control of the toe→heel transition.*

### 2. Calf raises — for the toe edge / toe landing
Straight-leg and bent-knee versions (gastroc and soleus separately). Slow eccentric.
*Corpus cross-reference: `OA_triple_extension` documents plantar-flexor atrophy as the first thing
lost under disuse — this is the tissue the toe landing depends on.*

### 3. Two-Foot Ankle Hop — already in the corpus
Verbatim from `Plyometric_Drills`: *"Get into a comfortable, upright stance with feet shoulder width
apart… hop up"*, ankle-driven, minimal knee. Builds the stiff, quick ankle a running-man cycle needs.
**This is the one drill here that was already in David's own library.**

### 4. Single-leg stand → eyes closed
30s per leg, progress to eyes closed, then to an unstable surface. The running man spends its whole
cycle on one foot.
*Snowboard sources recommend doing this in boots — the shuffle equivalent is doing it in the shoes
you actually dance in, since sole stiffness changes everything.*

### 5. Lateral jump drills — for edge transitions
Side-to-side bounds, land quiet, immediately reverse. This is the T-Step demand: change edge under
load, repeatedly, on tempo.

### 6. Bosu / unstable-surface squats
Forces continuous ankle correction. Lowest priority — real but indirect.

## Honest limits

- **Nothing here is validated against shuffling.** It is validated for snowboarding, and grafted on
  a mechanical similarity David identified. Nobody has tested whether it transfers.
- **The toe/flat distinction it partly rests on is itself an open question** — see
  `_toe_vs_flat_open` in `moves.json`. If toe-vs-flat turns out to be a coaching cue rather than a
  real difference, drills 1 and 2 are still sound conditioning but the *rationale* changes.
- **`mcp-sport.db` has no board-sport collection at all** (checked: zero matches for snow/board/ski/
  skate across 76 collections). Everything snowboard-specific here came from the open web, not from
  the corpus, so it carries none of the corpus's provenance guarantees. Candidate for `kega-acquire`.

## Sources
Corpus: `Plyometric_Drills`, `OA_triple_extension`, `mass_general_jump_and_plyometric_training`,
`Wushu_Taolu_Judging_Rules_2019` (balance), `Capoeira_100` (conditioning sequences).
Web: REI Expert Advice; MobilityDuo snowboard balance training; ClareMotion PT; Axis Sports Medicine;
SkyTechSport edge control.