Supinated Seated Curls

Start: Sit up straight at the end of a bench. With an underhand grip, hold two dumbbells straight down, at arm's length.

Finish: Curl the weights toward your shoulders. Stop and squeeze when the dumbbells are 6 o 8 inches in front of your shoulders. Hold the contraction for a beat, then slowly return to the starting position. Don't lean back to help yourself lift more weight, and keep your upper arms against your sides throughout the exercises.

For a more forceful contraction that combines the biceps two major functions, start with your palms facing each other I the down position and rotate them as you curl so they face your shoulders at the top Rotate them back on the way down.

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