Dumbbell Preacher Curl exercise animation (Male)

Dumbbell Preacher Curl

Target muscle
Brachialis
Synergist muscles
Brachialis, Brachioradialis
Equipment
Dumbbell
Body part
Upper Arms
Type
Strength

The dumbbell preacher curl is an isolation exercise that targets the brachialis, the muscle beneath the biceps that adds thickness to the upper arm, with the brachioradialis of the forearm assisting. Performed one arm at a time with your upper arm braced against a preacher bench pad, it locks out momentum and forces strict, fully supported curling through the full range.

How to do the Dumbbell Preacher Curl

  1. 1Set the preacher bench so the top of the pad sits just under your armpit, and pick up a dumbbell in one hand.
  2. 2Sit or stand against the bench and lay the back of your upper arm flat on the pad, shoulder relaxed and chest against the top of the pad.
  3. 3Hold the dumbbell with a supinated grip (palm facing up) and let the arm hang almost straight, keeping a slight bend at the elbow under tension.
  4. 4Curl the dumbbell up by flexing at the elbow, keeping your upper arm pinned to the pad throughout.
  5. 5Squeeze at the top when your forearm is roughly vertical, without letting your elbow lift off the pad.
  6. 6Lower the dumbbell slowly under control until your arm is nearly straight, resisting the weight on the way down.
  7. 7Complete all reps on one arm, then switch the dumbbell to the other hand and repeat.
  8. 8Set the dumbbell down with control once both arms are done.

Form tips

  • Use a strict tempo — about one second up and two to three seconds lowering — since the pad already removes momentum and the eccentric is where the brachialis works hardest.
  • Keep your shoulder pressed into the pad and your wrist neutral so the elbow does all the work and the load stays on the target muscle.
  • Stop just short of locking the elbow at the bottom to keep constant tension and protect the joint.
  • Start lighter than you would for standing dumbbell curls; the braced position is far stricter and exposes any cheating.

Common mistakes

  • Letting the elbow drift up off the pad at the top, which shortens the range and shifts work away from the brachialis.
  • Dropping the dumbbell quickly on the way down, wasting the eccentric and straining the elbow tendon at the stretched position.
  • Bouncing or jerking the weight up with the shoulder instead of curling strictly from the elbow.
  • Using too heavy a dumbbell, which forces you to round the shoulder forward and pull off the pad to complete the rep.

Frequently asked questions

What muscles does the dumbbell preacher curl work?

It targets the brachialis, the muscle under the biceps that builds upper-arm thickness, with the brachioradialis in the forearm assisting. The braced pad isolates the elbow flexors and removes momentum.

Why use a dumbbell instead of a barbell or EZ-bar for preacher curls?

A dumbbell works one arm at a time, so you can fix strength imbalances between sides and rotate the wrist freely into full supination, which the brachialis and brachioradialis respond well to.

Is the dumbbell preacher curl good for beginners?

Yes. The preacher pad supports the upper arm and enforces strict form, making it a safe way for beginners to learn elbow flexion without swinging. Start light and focus on a slow, controlled lowering phase.

How many sets and reps should I do?

For arm growth, 3 to 4 sets of 10 to 15 reps per arm works well. Since this is an isolation move, keep the weight moderate and prioritize a full range with a controlled eccentric over heavier loads.

Related exercises