The engine of speed. One max countermovement jump, measured by flight time.
Vertical force production in one maximal effort — how much you can put into the ground, and how quickly.
This is the quality built in the gym, and it feeds every other number on the radar: force produced vertically is what gets converted into horizontal force in the first step. It is also the most sensitive of the six. A countermovement jump drops before an athlete says they feel tired, which makes it the cheapest early warning a coach has for accumulated fatigue — one jump, and you know whether today is a hard day or not.
Phone in portrait, side-on, full body in frame.
Stand completely still for two seconds — the engine calibrates your standing height.
One max jump: dip, explode, arm swing allowed. Legs straight in the air and at landing.
Height comes from flight time — your centre of mass, not your reach.
Flight time is read from the feet leaving and reaching the ground, interpolated between frames; height = g·t²/8. A centre-of-mass cross-check means tucking your knees mid-air doesn't inflate the number.
A deliberate knee-tuck was tested in the field — it does not raise the result. That's the point. And we won't put a combine number beside yours: those are measured on a Vertec, by how high a hand reaches, which sits roughly 14 cm above where the body's centre of mass actually got. Different quantity, flattering direction. We quote ours.
The test day, the 15-minute block, and the case that gets the club to pay. The date isn't set yet — join the list and you're first in.
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