Step-by-Step Instructions

1
Adjust the preacher bench so that the top of the pad sits snugly in your armpits when seated, and hold a dumbbell in one hand.
2
Drape the back of your working arm fully along the pad, from the armpit to the elbow, with the palm facing up.
3
Start with the arm nearly fully extended — maintain a slight bend to protect the elbow joint under load.
4
Curl the dumbbell upward by flexing the elbow, keeping the upper arm pressed into the pad throughout.
5
Squeeze at the top when the forearm approaches vertical, holding for one second to maximize contraction.
6
Lower the dumbbell under control over 3-4 seconds back to near-full extension, avoiding a sudden drop that could hyperextend the elbow.

Common Mistakes

Lifting the elbow off the pad at the top of the curl, which allows shoulder flexion to assist and reduces biceps isolation.
Extending the arm completely at the bottom under heavy load, which places dangerous stress on the biceps tendon and elbow ligaments.
Positioning the pad too low on the arm so that only the forearm rests on it, allowing upper-arm movement.
Curling the wrist upward at the top in an attempt to squeeze harder, which overloads the wrist flexors and risks strain.

About This Exercise

The dumbbell preacher curl locks the upper arm against a preacher bench pad angled at approximately 45 degrees, removing any ability to swing or use momentum. This strict positioning preferentially targets the short (inner) head of the biceps brachii due to the shoulder-flexed arm angle, and also heavily recruits the brachialis. The preacher curl is particularly effective for developing the lower biceps near the elbow and building a full, rounded biceps peak.

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