Box Squat

The box squat is a squat performed to a box set at a fixed height, with a brief controlled pause before the concentric drive. It serves two distinct purposes: a teaching tool for depth calibration, and a strength tool for eliminating the stretch-shortening cycle reflex and developing pure concentric power from the bottom position. It is a cornerstone exercise in the Westside Conjugate system for this reason.

Execution

1. Set the box so the target depth is reached when sitting on it (typically parallel or slightly below)
2. Set up with the bar on the upper back as in a back squat
3. Sit back and down onto the box with the shins near-vertical; do not allow the knees to travel excessively forward
4. Pause briefly on the box without fully relaxing — maintain tension in the hips and lower back
5. Drive up explosively through the mid-foot

Why the Dead Stop Matters

In a standard squat, the stretch-shortening cycle (SSC) stores elastic energy at the bottom and contributes to the upward drive. The box squat's pause interrupts the SSC, requiring the lifter to initiate the concentric phase from zero stored elastic energy. This is specifically why Westside uses box squats for dynamic effort work: the explosive drive from a dead stop trains rate of force development without the SSC crutch.

Box Height Selection

Box height	Depth achieved	Primary use
Above parallel	Partial squat	Early rehabilitation, heavy load exposure
Parallel	Hip crease at knee	Depth calibration and competition prep
Below parallel	Full squat	Advanced bottom-position strength

Critical Technique Points

• Do not crash: The descent must be controlled; crashing loads the lumbar spine dangerously
• Do not fully relax: Maintain hip tension; releasing completely compresses the spine and defeats the training purpose
• Drive straight up: Not forward — the bar path should be vertical from the box

For system-specific training applications, see each system's lens entry.