The Athletic Index · The Four Capacities
The Four Capacities
Every number the Index produces traces back to four capacities: what your body can reach, own, produce, and repeat.
Access
Can you reach the positions?
Joint range and the ability to get to athletic positions at all.
In developmentControl
Can you own the positions?
Stability and coordination — keeping force pointed where it matters.
In developmentExpress →
Can you produce force?
Sprint speed, jump height, quickness, strength — the visible layer.
Sustain →
Can you keep doing it?
Capacity and repeatability — holding output when it counts.