What is the difference between preacher curls and regular barbell curls?

Preacher curls brace your upper arms on a pad to isolate the biceps and eliminate body momentum, while regular barbell curls allow more involvement from the shoulders and core. This makes preacher curls more effective for strict biceps isolation but typically requires lighter weight.

Should my arms be fully extended at the bottom of a preacher curl?

Your arms should reach near full extension but not lock out completely at the elbow. Stopping just short of lockout keeps tension on the biceps and reduces stress on the elbow joint.

What grip width is best for barbell preacher curls?

A shoulder-width grip is standard and works well for most lifters to target the overall biceps. A slightly narrower grip emphasizes the long head, while a wider grip shifts focus to the short head, though the differences are modest.

Preacher Curl (Barbell)

The preacher curl is a barbell biceps exercise performed with the upper arms braced against an angled pad to isolate the biceps and minimize momentum. It suits lifters who want to build biceps size and strength with strict form and reduced involvement from other muscle groups.

Muscle group: Biceps
Primary muscles: biceps
Equipment: Barbell

How to do the Preacher Curl (Barbell)

Set the preacher bench so the top of the pad sits comfortably under your armpits when seated or standing.
Grip the barbell with an underhand grip at shoulder width and rest your upper arms flat against the pad with elbows slightly below the top edge.
Lower the barbell in a controlled manner until your arms are fully extended but not locked out.
Curl the barbell up by flexing your biceps until your forearms are nearly vertical.
Squeeze at the top briefly, then lower the barbell back to the starting position under control.

Form tips

Keep your upper arms pressed firmly against the pad throughout the entire movement to prevent your elbows from lifting off.
Avoid leaning back or using your torso to assist the curl, which defeats the isolation purpose of the preacher bench.
Stop just short of full elbow lockout at the bottom to maintain constant tension on the biceps and protect the elbow joint.

Common mistakes

Lifting the elbows off the pad during the curl reduces biceps isolation and allows momentum to take over the movement.
Using too much weight forces you to swing or jerk the barbell, which increases injury risk and reduces muscle tension.
Rushing the lowering phase wastes the eccentric portion of the lift, which is critical for biceps growth and strength.

Sets and reps

For hypertrophy, perform 3 to 4 sets of 8 to 12 reps with moderate weight, and for strength, use 3 to 5 sets of 4 to 6 reps with heavier weight.

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Frequently asked questions

What is the difference between preacher curls and regular barbell curls?: Preacher curls brace your upper arms on a pad to isolate the biceps and eliminate body momentum, while regular barbell curls allow more involvement from the shoulders and core. This makes preacher curls more effective for strict biceps isolation but typically requires lighter weight.
Should my arms be fully extended at the bottom of a preacher curl?: Your arms should reach near full extension but not lock out completely at the elbow. Stopping just short of lockout keeps tension on the biceps and reduces stress on the elbow joint.
What grip width is best for barbell preacher curls?: A shoulder-width grip is standard and works well for most lifters to target the overall biceps. A slightly narrower grip emphasizes the long head, while a wider grip shifts focus to the short head, though the differences are modest.

More bicep exercises

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