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Ab belts may cause muscle contractions if used properly. But the belt alone cannot produce six-pack abs. The real challenge to ab definition is the layer of fat that lies right under the skin, hiding muscle tone.
Hip belt squats circumvent this as the hips and legs take on the lion's share of the load. It also works well for anyone with an upper extremity injury to the shoulder, elbow, wrist, or hand that may struggle to support the bar during back squats, front squats, or Zercher squats.