Including one arm dumbbell preacher curls in your workout routine is a smart choice if you want to build well-developed biceps.
It is an effective movement that is used to gain not just mass but strength in the bicep muscles.
One of the biggest factors that makes one arm dumbbell preacher curls effective in increasing the bulk of the biceps is the exceptional isolation of the upper arm through stabilization when it is on top of the preacher curl bench.
Added stability is seen through the shoulder joint and front deltoids, and more particular on the forearm muscles along with the wrists and hands to keep a firm grip on the dumbbell.
Performing this exercise provides a high concentration to target and develop the upper arm muscles since the flexion and extension from the muscles is optimized.