Box Squat

Move · Resistance Training · Movement, Typed Supps

The box makes every rep stop at exactly the same depth, and takes away the bounce that normally helps you out of the bottom.

Stage by stage

Set-up (Depth fixed by box): The box top sets the exact depth of every rep, removing the usual variability between sets and sessions.
During the descent (Hips travel backwards): Sitting back keeps the shins vertical, lengthening the hip lever and shortening the knee lever.
At the bottom (Elastic energy dissipates): Pausing lets stored tendon energy and the stretch reflex fade, so nothing is left to rebound out of.
Weeks later (Force from a dead stop): Concentric-only starting strength and hip drive improve, and tend to carry over to the free squat's bottom position.

Muscles trained

Primary: glutes, quads
Secondary: adductors, calves, lower back

Intensity

5 METs (Resistance (weight) training, squats, slow or explosive effort).

Time to effect

Weeks: Most of the early change is technical — within a couple of weeks lifters typically get noticeably better at sitting back onto the box under control rather than free-falling into it, which is the whole point of the drill.
Months: Over 2 to 3 months, the pattern reinforced by the box tends to carry over into a stronger, more hip-driven free squat, since it specifically trains the posterior chain to do more of the work off the bottom.

Related supplements

Creatine Monohydrate

Common myth

"Resting on the box means the muscles relax, so it's a less effective squat." In reality: A proper box squat involves touching the box with control while keeping the hips and hamstrings tensed, not collapsing your full body weight onto it. Done correctly it removes the stretch-reflex bounce out of the bottom, which is exactly why powerlifters use it — it forces the muscles, not momentum, to initiate the ascent.