What Is A Concentration Curl. Concentration curls are a unilateral curl variation which challenge the biceps in a seated position with the working elbow supported by the thigh. This keeps the bicep stable and prevents other areas of the body supporting the lift, which places greater tension on the bicep.
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Aug 4, 2022 · Curl the weight up with control, keeping the wrist in a neutral position. Emphasize the squeeze at the top of the rep; avoid any backwards lean ...