Weightlifting Belt

A lifting belt is worn snugly around the trunk. Contrary to common belief, it does not "hold the back in" passively — instead, you brace your abdominals outward against the belt, which increases intra-abdominal pressure (IAP) and helps stabilize the spine during heavy efforts (this works together with the Valsalva maneuver; see breathing-valsalva, bracing). Higher IAP can support bigger loads on lifts like the back-squat and deadlift.

Types. Powerlifting belts are a uniform width all the way around (often 10 mm/13 mm thick, ~4 in wide) with prong or lever closure — maximal support. Tapered/Olympic belts are wider at the back and narrower in front for more comfort during dynamic lifts. Nylon/velcro belts are lighter and more flexible.

When it helps: near-maximal, spine-loaded compound lifts (heavy squats, deadlifts, overhead presses). It is not needed for light/moderate work and should not replace building a strong, well-braced trunk on its own.

Important caveats and safety: belts are an aid, not a guarantee of safety, and over-reliance or misuse carries its own concerns — see weightlifting-belt-safety-concerns for the full discussion (don't use a belt to lift loads your trunk can't otherwise control, fit/position matters, and IAP/Valsalva raises blood pressure transiently).

• Works by giving the abs something to brace against → raises intra-abdominal pressure to stabilize the spine.
• You brace outward into the belt; it does not passively hold the back.
• Types: uniform-width powerlifting (10/13 mm), tapered Olympic, nylon/velcro.
• Reserve for near-max spine-loaded lifts; not for light work.
• Not a substitute for trunk strength; see safety concerns before relying on it.

• weightlifting-belt-safety-concerns — full safety discussion and cautions.
• breathing-valsalva — the belt works with braced breath-holding.
• bracing — bracing technique the belt amplifies.
• back-squat / deadlift — primary use cases.
• knee-sleeves-wraps — the analogous joint-support gear for the knee.