Machine Preacher Curls
A preacher curl driven by a cam and a stack rather than a bar. The pad holds the upper arms sloped forward and pinned, which kills every scrap of shoulder assistance and makes the bottom of the rep — arms almost straight, biceps loaded and long — the hardest and most fragile part of the movement.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Set the seat height so the top edge of the pad sits under your armpits and your shoulders stay down.
- Lay the back of the upper arms flat on the pad with the elbows in line with the machine's pivot.
- Take the handles underhand with the elbows about shoulder width, not splayed out to the sides.
- Choose a weight you can start from almost-straight arms without a jerk to get it moving.
- Sit close enough that your chest touches the top edge of the pad. Sitting back turns every rep into a half rep.
Every rep
Breathing & tempo — Exhale as you curl, inhale as you lower. Two seconds up, a one-second squeeze, three seconds down, and a short pause at the bottom instead of a bounce.
Before you load it
- Never snap out of the fully extended bottom position. A preacher curl concentrates load on the biceps at its longest, which is where distal tendon tears occur, so a controlled reversal is not optional.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start light — a quarter of the stack, or roughly what a 15-20 kg EZ bar would feel like. The marker to progress is starting a rep from almost-straight arms with no jerk on your last set. Add one plate once 15 controlled reps with a one-second squeeze feel easy, and add the plate rather than pushing reps past 15.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Lower to almost-straight, pause for a beat, then curl. The bottom of a preacher curl under load is the classic biceps tear position, and a bounce is what turns a hard rep into a torn tendon.
Press the back of the upper arms down into the pad and end the rep where they start to lift. If they lift on the third rep, the weight is wrong rather than your range being short.
Slide forward until your chest touches the top edge of the pad and your armpits rest on it. A preacher curl done from a slouch is a half rep with extra shoulder strain attached.
Expect to use roughly half your standing barbell curl weight. There is no hip drive and no shoulder flexion here, so the number on the stack is not comparable to anything else you curl.
Why bother
The angled pad is the whole mechanism. With the upper arms sloped forward and held down, the shoulder cannot flex to help and the torso cannot rock, so the biceps carries the load from the first degree of the rep to the last. The trade is range: that arm position already shortens the long head, so you are training the elbow flexors rather than the biceps at full length.
A cam changes the loading curve compared with an EZ-bar preacher. The barbell version is savage at the bottom and nearly free at the top; the machine keeps resistance on through the top half as well. That makes the machine better for high-rep work and the barbell better if what you want is the loaded stretch.
Where it fits
After your compound pulling, 10-15 reps, two or three sets. Because the pad enforces the position, it is a good long-term fixture for anyone whose curls drift as they fatigue. Do not stack it in the same session with a spider curl or a lying high-bench curl — they train the same shortened arm position.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
Start here instead
Asked and answered
Is the machine version as good as a preacher curl with an EZ bar?
For hypertrophy it is at least as good, and it is easier to take to failure because nothing collapses when you tire. The EZ bar loads the stretched bottom harder, which some people want and some people's elbows will not tolerate. If the machine is free and the bench is not, you lose nothing meaningful.
Why does the bottom of the rep hurt my elbow?
Usually because you go from a fully locked-out arm straight into a curl, with the load at its worst leverage. Stop a few degrees short of lockout, pause, and reverse deliberately. If that does not fix it, the weight is simply too heavy for this arm position and no cue will rescue it.
Does the preacher pad build a biceps peak?
No. Peak is the shape of the muscle belly you inherited, and no exercise changes where the belly sits on the bone. What the pad does is make cheating impossible, which builds more biceps than a sloppier movement with a bigger number on it — but the shape that grows is the one you were born with.
Do I still need incline curls if I do preacher curls?
Yes. The preacher pad holds the upper arms in front of your torso, which shortens the long head of the biceps before the set starts; an incline curl hangs the arm behind you and lengthens it. They load opposite ends of the same muscle's length range, and the stretched end is the one with the better evidence behind it. Run an incline or lying dumbbell curl first in the session and use the preacher machine after it, not instead of it.