Criterion Bodybuilding Arm Bar Attachment

The Criterion Arm Bar is a specialized, vintage-style revolving curl bar designed for maximum bicep/forearm isolation with reduced joint strain. It features rotating handles that allow for natural pronation-to-supination movement during curls. Developed by Bruce Pearson, it is considered a premium, ergonomic tool for strict curls, often associated with a Rich Gaspari-designed version.