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bodybuilding jim training leather belt is the best reason to use a weightlifting belt is to increase intra-abdominal pressure, or pressure in your abdomen, during heavy or strenuous weight lifting. This pressure creates a rigid core, stabilizing your spine and helping increase your maximum power. This pressure also keeps your spine from collapsing under heavy weight. You can create your own intra-abdominal pressure by breathing in, holding your breath, and pushing out with your stomach muscles, a move called the Valsalva maneuver. The weight belt gives your stomach something to push against, increasing your pressure.