Preacher Curl
The preacher curl pins your upper arms against an angled pad, taking your shoulders and back completely out of the lift so your biceps do all the work. That strict position makes it one of the most isolated ways to train the biceps, and it suits anyone who wants to build arm strength without any body english sneaking into the rep. It works equally well as a main arm exercise or as a finisher after heavier pulling work.
Why it works
Standing curls let you sway your hips or lean back to help move the weight once your biceps start to fatigue, and that small cheat shifts load off the muscle you're trying to train without you even noticing it happen. The preacher pad removes that option entirely by locking your upper arm in place against the bench, so the only way to move the bar is by contracting your biceps. That strict setup also stretches the biceps more at the bottom of the rep than a standing curl does, since your arm hangs fully extended over the pad instead of stopping at your side. Starting each rep from that longer, more stretched position is also why the first few reps of a set can feel harder here than the same weight would standing, well before fatigue is the reason.
Set up
- Set the preacher bench pad height so your armpits rest just over the top edge when seated.
- Grip the barbell with your palms facing up, hands shoulder-width apart.
- Rest the backs of your upper arms flat against the pad before you start.
- Keep your feet flat on the floor and your chest against the bench for support.
How to do it
- Start with your arms extended and the bar hanging just above the bottom of the pad.
- Curl the bar up by bending your elbows, keeping your upper arms pinned to the pad.
- Squeeze your biceps hard at the top without lifting your upper arms off the pad.
- Lower the bar slowly back to the starting position, resisting it the whole way down.
- Pause briefly at the bottom before starting the next rep.
Form cues
- Upper arms stay glued to the pad the entire set.
- Control the lowering phase; don't just drop the bar.
- Squeeze at the top instead of just reaching it.
- Keep your wrists straight, not bent back.
Breathing: Exhale as you curl the bar up, and inhale as you lower it back down.
Common mistakes
Lifting the upper arms off the pad to help finish the curl.
Fix: Keep your armpits pressed to the pad the whole rep; if you need to lift your arms to finish, the weight is too heavy.
Dropping the bar quickly on the way down.
Fix: Lower the bar at the same controlled speed you used to curl it up; the lowering phase builds just as much strength.
Only curling through the top half of the range.
Fix: Let your arms extend nearly straight at the bottom before curling back up; cutting the range short skips the deepest stretch on the biceps.
Using a grip wider or narrower than shoulder-width, which twists the wrists.
Fix: Keep your hands roughly shoulder-width apart so your wrists stay straight and the load lines up evenly on both arms.
How to program it
- As a single-joint isolation move, two or three times a week works well, including on the same day as other pulling exercises.
- Sets of 8 to 12 reps suit the muscle-building goal most lifters use this exercise for.
- It pairs naturally after a heavier back exercise like rows or pulldowns, once your grip is already warm.
- Because the pad removes momentum entirely, use a lighter weight than you'd curl standing; most lifters are surprised how much less they can move here.
Safety notes
- Keep the range of motion controlled at the bottom; letting your elbows fully hyperextend under load can strain the joint over time.
- Choose a bar or grip you can hold securely through a full stretch; a slipping grip at the bottom of the rep is how bars get dropped.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
How many sets and reps of preacher curl should I do?
Two to four sets of 8 to 12 reps is a common range for building biceps size and strength with this exercise.
Can I do preacher curls without a preacher bench?
Not quite the same way. A close-grip EZ bar curl or a seated dumbbell curl against an incline bench gets closer to the isolation effect if you don't have a preacher pad.
Why do preacher curls feel harder than regular curls with the same weight?
Because the pad removes the momentum from your hips and shoulders that normally sneaks into a standing curl, your biceps have to do the entire lift on their own.
Should I curl with a barbell or dumbbells on the preacher bench?
Both work well. A barbell lets you load more total weight, while dumbbells let each arm move independently, which can help even out any strength difference side to side.
Why do my elbows hurt during preacher curls?
That usually means the weight is too heavy for you to control the full stretch at the bottom, or you're letting your elbows snap straight instead of stopping just short of full extension. Lighten the load and control the bottom of the rep.