Preacher Hammer Dumbbell Curl
The preacher hammer dumbbell curl combines the strict, momentum-free position of a preacher bench with a neutral, palms-facing grip instead of the usual underhand curl grip. That grip shift pulls your forearms into the lift alongside your biceps, so you build grip and forearm strength at the same time as arm size. It suits anyone who wants biceps work that also carries over to grip-dependent lifts like rows and deadlifts.
Why it works
A standard curl grip, palms facing up, puts almost all the tension on the biceps. Turning your palms to face each other, the hammer grip, shifts some of that tension onto the brachialis and the forearm muscles that control wrist and grip strength, since they now have to help stabilize the neutral wrist position under load. Pinning your arm to the preacher pad still removes any help from your shoulders or hips, so the biceps and forearms are left to do the entire rep on their own, just split between two muscle groups instead of one. That split is also why grip endurance for pulling exercises tends to improve faster from this version than from a standard curl, even when the biceps stimulus itself feels about the same.
Set up
- Set the preacher bench pad height so your armpits rest just over the top edge when seated.
- Grip one dumbbell per hand, palms turned to face each other and thumbs pointed up.
- Rest the backs of your upper arms flat against the pad before you start.
- Keep your chest against the bench and your feet flat on the floor.
How to do it
- Start with your arms extended and the dumbbells hanging just above the bottom of the pad.
- Curl both dumbbells up while keeping your palms facing each other the whole way.
- Squeeze at the top without letting your upper arms lift off the pad.
- Lower the dumbbells slowly back to the starting position, resisting the whole way down.
- Pause briefly at the bottom before starting the next rep.
Form cues
- Palms stay facing each other from top to bottom.
- Upper arms stay pinned to the pad the entire set.
- Control the lowering phase instead of letting the weight drop.
- Keep your wrists neutral, not bending forward or back.
Breathing: Exhale as you curl the dumbbells up, and inhale as you lower them back down.
Common mistakes
Rotating the wrists toward a regular curl grip partway through the rep.
Fix: Keep your palms facing each other from the first inch of the curl to the last; rotating the grip shifts tension away from the forearms.
Lifting the upper arms off the pad near the top of the rep.
Fix: Keep your armpits pressed against the pad the whole set; if you have to lift your arms to finish, drop the weight.
Letting the dumbbells swing instead of moving in a straight, controlled line.
Fix: Move slowly enough that the dumbbells never gain momentum; a swinging weight means the muscle has stopped doing the work.
Cutting the bottom of the range short.
Fix: Let your arms extend nearly straight at the bottom before curling back up to get the full stretch out of each rep.
How to program it
- As a single-joint isolation move, two or three times a week fits well, including alongside other arm or pulling work.
- Sets of 10 to 12 reps suit the muscle-building and grip-strength goals most lifters use this for.
- Use a lighter weight than you'd use for a standard preacher curl; the neutral grip changes how the load pulls on your arm, and most lifters need to drop the weight a bit to compensate.
- It pairs well after a heavier pulling exercise like rows, letting you finish training grip and forearms while your arms are already warm.
Safety notes
- Keep the range of motion controlled at the bottom; letting your elbows snap into full extension under load can strain the joint over time.
- Choose dumbbells you can hold securely through the full stretch; a grip that slips at the bottom of the rep is how weights end up getting dropped.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
What's the difference between a preacher curl and a preacher hammer curl?
A regular preacher curl uses an underhand grip that targets mostly biceps. The hammer version uses a neutral, palms-facing grip that shares the work between your biceps and forearms.
How many sets and reps of preacher hammer dumbbell curl should I do?
Two to four sets of 10 to 12 reps works well for building both arm size and forearm strength.
Can I do this exercise with a barbell instead of dumbbells?
Not with a true neutral grip; a barbell forces your palms into a fixed position. Dumbbells or a rope attachment let each hand rotate to hold the hammer grip.
Why do my forearms get tired faster with this curl than a regular preacher curl?
The neutral grip recruits your forearm muscles to help stabilize the wrist and dumbbell, so they fatigue alongside your biceps instead of staying mostly uninvolved.
Should I train each arm separately on the preacher bench?
You can curl both dumbbells together or one at a time. Training one arm at a time lets you focus more closely on keeping the upper arm pinned and the tempo controlled.