Sprint-Mechanics 101

Obj: Running taught — posture, arm action, and shin angles: the mechanics installed before speed is chased (7.4's speed strand's grammar). Field: 40×20yd sprint lanes. Equip: Cones, optional mini-hurdles for wall-drill spacing. Org: The mechanics menu in short blocks: posture holds (tall hips, slight lean from the ankles — "proud chest, long neck"), arm-action isolation (cheek-to-cheek hands, elbows driving back — seated then standing then jogging), wall drills (the piston knee-drive at a fence/wall — shin angles felt), A-skip patterns (the rhythm that organizes it all), then short build-up runs applying one cue at a time (never all cues at once — the coaching law of one thing). CP: (1) Arms drive legs (the fix for most young sprinters lives at the elbows); (2) push the ground BACK, not down (the shin angle's meaning made simple); (3) relaxed face and hands (tension is a brake — "fast is loose"). Prog: Cues layered into A-03's timed gates; ball-carrying mechanics (A-21's GP informed by this grammar). Reg: Walk-pace patterning; single-cue sessions. Mist: P: trying harder instead of moving better (effort masks mechanics — film a run, show the difference); C: sprint mechanics only in warm-ups' margins (it's a curriculum item with its own block, 4.13). Time: 12 min weekly in-block. Out: Visible posture/arm improvements; the vocabulary owned ("shins!" self-corrects). Var: Video-feedback days (slow-motion phone clips — the mirror that convinces). Diag: Sprint lane with posture line, arm-drive arc icons, wall-drill shin angles, A-skip rhythm marks.