Countermovement Jump

Stretch-shortening utilisation, unweighting, net impulse, and jump height from COM flight.

Run in Capture Lab

Setup

Hands on hips (akimbo) unless arm-swing is the research question
Quiet stand 1 s before the dip
Land on the same spot; full foot contact visible

Scoring rubric

Jump height from flight time or COM apex
Eccentric depth moderate (knee ~70–90°), not a quarter-squat
Landing peak GRF not grossly above take-off (stiff collapse)

Literature

Bosco, Komi & Ito 1983; McMahon et al. 2018 — CMJ phase structure and strategy.

Tracked joints: hip, knee, ankle, COM. The kinematic engine is a teaching model scaled to the active subject. Export CSV from the report for your own processing.