Preacher Curls: Why the Bottom Feels Brutal and What It Does for Your Biceps

Preacher curls feel brutally heavy at the bottom because the pad fixes your upper arm in place, so the stretched half of the rep does most of the hard work. That is why the same weight you curl standing can feel too heavy here. Do they grow the lower biceps and put your tendon at risk? Probably a small yes to the first, and no study shows the second, though the bottom position does deserve respect.

This is a deep dive into preacher curl benefits and form, inside our complete arm and forearm training guide. We will cover the mechanics, what the trials actually measured, how to set it up, and where the tendon-tear worry comes from.

Why do preacher curls feel so heavy at the bottom?

Two things stack up. First, the pad takes away your shoulder, your hips and any swing. Second, a dumbbell or barbell always pulls straight down, so the torque on your elbow depends on how far your forearm sits from the vertical line of the weight.

On a steeply angled pad the forearm hangs far from your body near the bottom, which makes that part of the rep feel heavy. This is basic mechanics, not a result from one study, and it changes with pad angle and body size. Gym preacher benches vary a lot, so what you feel on one bench may differ on another.

The researchers who ran the Nunes trial described the barbell version as applying greater torque when the elbows are extended and the biceps is stretched, and a cable version as applying it when the elbows are flexed (Nunes et al., 2020). That gives us a clean way to think about it: free weights on a preacher bench lean toward the bottom, cables lean toward the top.

Does the preacher curl grow the lower bicep?

Be careful here. You cannot pick where a muscle grows, but some exercises seem to bias growth toward certain regions. Here is what the studies found, and they do not fully agree.

Women, 8 weeks (Pedrosa et al., 2023). Nineteen untrained young women trained one arm in the first part of the range (elbow near straight) and the other in the last part. The stretched-range arm grew more at 70% of upper-arm length, the region nearer the elbow, while the 50% site and the summed CSA were similar (Pedrosa et al., 2023). The stretched-range arm also gained more strength on a full-range test.

Women, 9 weeks (Zabaleta-Korta et al., 2023). Thirty-eight recreationally trained women did either incline curls or preacher curls. Only the 70% region of the preacher group grew significantly, but there were no significant differences between regions or groups, so this is suggestive rather than conclusive (Zabaleta-Korta et al., 2023).

Men, 10 weeks (Attarieh et al., 2025). Fifteen young men trained one arm with a preacher cable curl and the other with a Bayesian cable curl, matched for resistance profile. Both grew the biceps similarly at the proximal, middle and distal regions (about 6-9%), with no significant difference between them (Attarieh et al., 2025).

Why might they differ? Different populations, different exercises being compared, and small samples. All these trials used young, mostly untrained or recreationally trained people. We do not have strong data in advanced lifters.

The cautious takeaway: training the stretched half of the curl looks useful, and it may nudge growth toward the distal biceps, but do not expect a visibly “lower” biceps from one exercise.

Does it matter where the load peaks? Cable vs barbell preacher curls

Not as much as you might expect. In the Nunes trial, 35 young adults trained preacher curls for 10 weeks, three days a week, 3 sets of 8-12. Biceps thickness rose 7% in the cable group and 8% in the barbell group, which was not a meaningful difference. Strength at the 20 degree elbow angle (near extension) rose 30% for cable and 39% for barbell, a significant difference only at the longer muscle length (Nunes et al., 2020).

So you get the muscle growth either way. The setup mainly changes which joint angles you get strong at.

A broader review of range-of-motion studies found full range helped lower-body hypertrophy, but upper-limb evidence was limited and conflicting, so strong conclusions were not possible (Schoenfeld and Grgic, 2020). That is a useful reality check on any strong claim about arms.

Preacher curls vs incline curls

If you use both, you are covering both shoulder positions. A 2026 MRI study in 21 untrained adults trained one arm with incline dumbbell curls and the other with preacher dumbbell curls for 12 weeks. The biceps grew more after incline (+22.1% vs +18.9%), while the brachialis (+17.1% vs +21.1%) and brachioradialis (+13.5% vs +17.6%) grew more after preacher. Total elbow flexor growth did not differ (Kobayashi et al., 2026).

The differences were small to moderate. For a head-to-head breakdown, see incline curls vs preacher curls, and for the cable alternative read preacher curls vs Bayesian cable curls.

How to do a preacher curl with good form

The point of the exercise is control at the bottom. Use this setup.

• Adjust the seat so your armpits sit snug on the top of the pad.
• Grip the bar or dumbbell about shoulder-width, wrists neutral.
• Lower for 2-3 seconds until the elbow is almost straight, not locked.
• Curl up without lifting your chest or shoulders off the pad.
• Squeeze briefly at the top, then repeat.

Reps and effort: 8-15 reps works for most people, and a 2024 meta-regression found that muscle growth tended to be greater when sets ended closer to failure, with strength gains similar across a wide range of reps in reserve (Robinson et al., 2024). On preacher curls I would stop at 1-3 reps in reserve, because form tends to fall apart in the stretched position first. Our RIR and RPE calculator can help you check how hard a set really was.

Dumbbell, barbell, EZ-bar or machine: which setup?

Setup	Where it tends to load hardest	Good for	Watch out for
Single-arm dumbbell	Stretched half (pad angle dependent)	Fixing left-right differences	Weight swinging at the bottom
EZ-bar	Stretched half	Heavier loading, easier on wrists	Dropping into the bottom
Straight barbell	Stretched half	Max loading	Wrist stress on some people
Cable preacher	Squeezed half (per Nunes)	Smooth, steady tension	Needs a proper bench setup
Machine	Depends on cam	Beginners, easy control	Poor fit for very short or tall lifters

Pick the one that lets you control the bottom without pain. No setup is magic. If you are on a budget in an Indian commercial gym, an EZ-bar and a fixed preacher bench are usually enough.

Do preacher curls tear the biceps tendon?

This is where the fear comes from, so here is what is actually known.

The distal biceps tendon attaches near the elbow crease. A distal biceps rupture is a rare injury. A 2025 hospital review of 73 patients (72 men, 1 woman, mean age 45.6) found that lifting heavy objects was the most common cause (43.8%) and sports injuries accounted for 13.7%. The authors note a higher incidence in weightlifters and bodybuilders (Almigdad et al., 2025). A large systematic review of repairs also describes these injuries as typically occurring in the dominant arm of men in their fourth decade (Amarasooriya et al., 2020).

Neither paper links the injury to preacher curls. No study I found shows that preacher curls cause distal biceps ruptures. What we can say is that a heavy, uncontrolled load on an extended elbow is the kind of situation worth avoiding, which is why the rules above stress control.

If you feel a sudden pop, sharp pain at the front of the elbow, bruising, or a sudden loss of curling strength, stop training and see a doctor. Persistent soreness in that area is worth a physiotherapist visit. We cover this further in distal biceps tendonitis and elbow rehab. This article cannot diagnose anything.

How often and how much?

Most of the trials above used two or three sessions a week with 3-5 sets of 8-12 reps. For most people, 2-4 hard sets of preacher curls once or twice a week is enough as one of two or three biceps movements. For total weekly arm volume, see direct vs indirect arm volume.

Start lighter than you think, especially on a new bench, and build up over three or four weeks. If you want to slot this into a split, our free pull day plan shows where curls fit.

The bottom line

Preacher curls are a good, strict biceps exercise. They load the stretched position harder than most curls, they may bias growth toward the lower biceps a little, and they grow the arm about as well as other curl variations in the trials we have. They are not magic, and they are not proven dangerous. The cost is just control: slow the lowering, skip the bounce, stop short of failure and treat sudden elbow pain as a reason to see a doctor.