Box Jump

Move · High-Intensity · Movement, Typed Supps

Box height measures how high the knees can be tucked, not how high the body actually rose.

Stage by stage

Set-up (Countermovement loads the legs): A short dip stretches the hip and knee extensors immediately before extension, adding force through the stretch-shortening cycle.
During the jump (Concentric power output): Height cleared measures foot displacement plus knee tuck, not how far the centre of mass actually rose.
On landing (Eccentric load largely removed): Landing on the box shortens the fall, keeping ground reaction forces low; jumping down reintroduces the impact.
Weeks later (Neural adaptation leads): Early gains come from faster motor unit recruitment, and the stimulus degrades with fatigue, so sets stay short.

Muscles trained

Primary: glutes, quads
Secondary: abs, calves, hamstrings, hip abductors

Intensity

8 METs (Circuit training, including kettlebells, some aerobic movement with minimal rest, general, vigorous intensity).

Time to effect

Weeks: Jump height and landing confidence both improve quickly as the nervous system adapts to producing force fast — most early gains here are neurological rather than muscular.
Months: Genuine explosive power in the legs builds over months of consistent practice, which is part of why box jumps are a staple in programs for sprinters and jumping-sport athletes.

Related supplements

Creatine Monohydrate

Common myth

"A higher box always means a better athlete." In reality: Jump height is influenced by leg length and technique as much as raw power — coaches generally care far more about a soft, controlled landing than about maximizing box height.