Sit at a preacher bench with feet shoulder-width apart, holding a dumbbell in each hand.
Curl one dumbbell towards your shoulder.
Lower the dumbbell back to the starting position and repeat with the other arm.
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About this exercise : An alternating version of the preacher curl, focusing on isolating each bicep. This exercise is excellent for building bicep size and improving muscle definition. The preacher bench helps in minimising momentum.