Deltech Fitness Preacher Curl Bench (DF306)

The preacher curl mainly targets the biceps brachii, especially because the bench position isolates the elbow flexors and limits momentum.

Primary muscles worked

Biceps brachii

This is the main muscle being trained. It has two heads:

• Long head — contributes to the outer “peak” of the biceps
• Short head — contributes to thickness on the inner side of the arm

Preacher curls often emphasize the short head a bit more because of the arm position on the pad.

Secondary muscles involved

Brachialis

• Lies underneath the biceps
• Helps flex the elbow
• Building this muscle can make the arms look thicker overall

Brachioradialis

• A forearm muscle that assists with elbow flexion
• More active if using a neutral or EZ-bar grip

Stabilizing muscles

Forearm flexors

Help grip and stabilize the weight.

Anterior deltoid

Provides slight shoulder stabilization during the movement.

Why preacher curls feel different

Because your upper arms are fixed against the pad:

• momentum is reduced
• the biceps stay under tension longer
• the stretch at the bottom is increased

That makes preacher curls very effective for isolating the biceps compared with standing curls.