Short Head Bicep Exercises: 8 Moves Ranked by Evidence

Your arms can look solid from the side and still look narrow and flat from the front. The inner half of your bicep is what fills that gap.

Search for a fix and you get the same rule everywhere: use a wide grip to hit the short head. Nobody has ever tested it. Not one study.

The moves below still work. They are just ranked here by what the evidence actually supports, so the short head bicep exercises you spend your time on are the ones with a real reason behind them.

Key Takeaways

• The short head is the inner half of your bicep. It is what gives an arm width from the front.
• Nobody has ever tested whether grip width changes which head does the work. It is an assertion, not a finding.
• The one lever with any measured support is shoulder position, getting your arm in front of your body, not grip width.
• Both heads share one nerve and both do both jobs, so no curl switches either one off.

Short Head vs Long Head: What You Are Actually Training

The Short Head (Your Inner Arm)

Your short head starts at the tip of the coracoid process, a small hook of bone at the front of your shoulder blade. From there it runs down the inside of your upper arm to the radial tuberosity on your forearm.

That inner position is the whole point. It is the half that fills out your arm width from the front.

The Long Head (Your Outer Arm and Peak)

The long head starts higher, at the supraglenoid tubercle just above your shoulder socket, and runs down the outside of your arm to the same forearm bone. It gives you the peak. StatPearls maps both attachments in full.

It is also where the folklore breaks. A cadaver study of 17 elbows found the long head attaches further from the forearm’s rotation axis and is positioned as the stronger supinator, while the short head is positioned as the more powerful elbow flexor.

Read that against every article telling you to supinate harder to hit the short head. The anatomy points the other way.

Short Head vs Long Head at a Glance

	Short head	Long head
Where it sits	Inner arm	Outer arm
What it adds	Width from the front	The peak
Origin	Tip of the coracoid process	Supraglenoid tubercle
Better positioned for	Elbow flexion	Supination
Biased by	Arm in front of your body	Arm behind your body
Nerve	Musculocutaneous (C5 to C6)	Musculocutaneous (C5 to C6)

Both heads of the biceps brachii cross your shoulder and your elbow, and both bend the elbow and turn the palm up. One nerve drives them, the musculocutaneous (C5 to C6), so no curl removes either head from the movement.

Training the other head means getting your arm behind your body, which is what face-away cable curls are built for.

What the Evidence Actually Says About Targeting the Short Head

The rule gets stated with total confidence. Nobody ever names the study.

Nobody Has Ever Tested the Grip Width Rule

A PubMed search for biceps curl grip width electromyography, the standard way to measure muscle activation, returns zero results. That research exists for the bench press, never the curl.

The internet cannot even agree on the direction. Some sites say a wide grip biases the short head, others say a close grip does. Mutual contradiction is what folklore looks like.

Precision matters here: nobody has tested this. That is not the same as it being disproven.

The Study Everyone Cites Measured the Long Head Only

Oliveira 2009 is the paper the fitness internet reaches for here. Its own methods put the electrodes on the biceps brachii long head, and the short head was never instrumented.

Coratella 2023 goes further. Its authors state plainly that standard surface electrodes cannot separate the two heads at all.

What Does Have Support: Shoulder Position, Not Grip

One lever survives the scrutiny.

Brown 1993 recorded both heads separately in 16 subjects and found muscle length, but not load, significantly shifted the balance between them.

Lengthening the biceps favored the long head, so a shortened, shoulder-flexed position leans the other way. Hold it loosely though, because Brown tested rapid supination rather than curls, so it points at a mechanism rather than proving one.

That is still the lever, and it is why shoulder-flexed moves take slots 1 to 4 below while wide-grip sits at 7. A nudge to a ratio, not a switch.

Supination does not pick a head either. Coratella found a supinated grip drove about 19% more biceps excitation than a pronated one, but that is the whole muscle, and Perot 1996 recorded both heads during a supinating hold firing evenly.

Hammer curls mostly load the brachialis and brachioradialis, different muscles entirely.

Activation Is Not Growth

Every “this curl activates the short head more” ranking has a deeper problem. Vigotsky 2018 argues that inferring long-term outcomes from acute signal data should be condemned until those measures are validated.

So researchers stopped measuring signals and trained people. Larsen 2026 and Attarieh 2025 each ran 10 weeks of curls at different shoulder positions and measured real growth.

Larsen’s groups both grew about 7 to 9%, and neither trial found a meaningful difference between positions.

Neither measured the two heads separately. No growth study ever has.

So be clear on what the ranking below is. It orders these moves by how much evidence backs each one, a smaller claim than the one you came here for.

Position has a mechanism and a small measured effect; grip width has nothing.

1. EZ-Bar Preacher Curl

The move most lists rank fourth or fifth is the only one here with a measured mechanism.

A preacher bench pins your upper arm in front of your body with the shoulder flexed. That is the one variable anyone has recorded shifting the balance between the heads. A lean, not isolation, but enough to open the list.

• Sit on the edge of the seat, feet tucked back, body slanted into the pad so you cannot lean the weight up.
• Grip the angled sections of the EZ-bar and lower until your arms are almost straight, wrists stiff rather than curled under, or the work migrates into your forearm.
• Curl up under control and stop before your forearms go vertical and the tension drains out.

One honest trade-off: the preacher gives high tension over a narrower slice of the range.

One real complaint, too. Inner-elbow and wrist pain from preacher curls comes up constantly, from lifters with no connection to each other.

Usually it is the wrist position or the straight bar, not the exercise. Keep your knuckles in line with your forearm, use an EZ-bar, or go unilateral.

Best for anyone who wants the one move with a real mechanism behind it. Skip it if your elbows flare up, and take number 3 or 4 instead.

2. Spider Curl

The bar should not travel straight up on a spider curl. It goes toward your forehead, deliberately.

Lean over an incline bench and your arms hang dead vertical in front of your body. Shoulder flexed, no bracing at the bottom, no swing physically possible.

• Set an incline bench steep, lean your chest into it, and let your arms hang straight down.
• Curl toward your forehead rather than straight up, upper arms locked and pressing forward so only your forearms move.
• Lower through the bottom sticking point without swinging, core and glutes tight.

Dumbbells beat a bar here for range of motion.

No bench? Lean one shoulder against a power rack upright, step your feet back to create the forward lean, and let your arm hang completely free with no pad. Work one side per set.

One counter worth knowing. Spider curls load the peak-contracted position rather than the stretch, and stretch-biased curls may do more for growth. A live trade-off, not a settled question.

If you have a bench, this is the strictest way to train the position. If you have a rack and nothing else, it still works.

3. Machine Preacher Curl

If the EZ-bar preacher curl lights up your elbow, this is where you go next.

Same shoulder-flexed position, so the same modest evidence applies. What the machine adds is practical: it holds the resistance curve for you, and the setup repeats exactly, rep after rep.

• Set the chair height inversely to your own height: taller lifters go lower, shorter lifters go higher.
• Glue your armpit into the pad with your elbow at roughly its halfway point, then plant your feet and lean forward.
• Curl while imagining you are twisting your pinkies outward, then resist the negative to a stretch just short of losing tension.

Almost nobody sets that chair right, and it decides whether your armpit anchors or your elbow floats.

The machine will not let your pinkies rotate. The intent still sharpens the contraction.

Resistance curves also differ a lot between brands. Persistent inner-elbow pain on one preacher machine can disappear entirely on another. If a machine hurts, the machine might be the problem, not the exercise.

Best for lifters who want the position without the joint fight.

Skip it if your gym’s model feels wrong on your elbow, and try another.

4. Dumbbell Concentration Curl

Coaches cannot agree whether this is a short head move or a long head move. There is a good reason for that.

Brace your elbow against your inner thigh and your arm hangs in front of your body’s center line. Same family as numbers 1 through 3, for a dumbbell and a bench.

• Sit with your feet wide and brace the back of your working arm against your inner thigh.
• Curl with your wrist locked in full supination from the first second of the rep to the last.
• Lower slowly. Do not let the dumbbell drop back to the start.

The thigh brace kills momentum, which is why the contraction feels sharper here than almost anywhere.

About that disagreement. Plenty of sources file the concentration curl under long head instead, and since surface electrodes cannot separate the two heads anyway, nobody can settle it. Us included.

It is single-arm, so a session takes twice as long.

Against number 1: the preacher pad stabilizes you and lets you load heavier, while the concentration curl needs no bench and gives a stronger squeeze.

Our concentration curls vs preacher curls breakdown compares them directly.

5. Dumbbell Supinating Curl

Supinating hard is worth doing. Every reason you have been given for it is wrong.

A supinated grip produced about 19% more biceps activation than a pronated grip, as covered above. That is total biceps, not the short head. The study that recorded both heads during a supinating hold found them firing together, evenly.

So twist hard because it works the whole muscle harder. Not because it picks a head.

• Start neutral at the bottom with your palms facing your thighs.
• Twist to full supination as you curl, finishing pinky-high, holding the dumbbell closer to the outside of the handle so the weight resists the twist.
• Squeeze at the top, then lower under control and untwist on the way down.

Keep the wrist straight and stiff rather than flexed, or the tension slides into your forearm.

This one also fixes a real problem. Unilateral work lets each arm find its own joint alignment, so if bilateral bar curls give your elbows or wrists trouble, this is a genuine solution rather than a consolation prize.

The verdict: the best all-round free-weight curl on this list. Just not a short head specific one.

6. Cable Rope Supinating Curl

Move your feet and you change which part of the rep is hardest. It costs nothing, and almost nobody does it on purpose.

The case for this move has nothing to do with head bias. A dumbbell curl loses tension near the top as the lever arm collapses. A cable does not, and that constant tension is reason enough on its own.

The heaviest point of any cable curl is wherever your forearm and the cable form a 90-degree angle. Which means you pick where the hard part of the rep lives by picking where you stand.

• Clip a rope to the low pulley and set your distance from the stack deliberately rather than standing wherever you land.
• Curl with your elbows pinned, twisting to full supination through the top, which a rope allows and a straight bar does not.
• Resist the cable down without letting your elbows drift forward.

You need a cable stack, so most home gyms are out. Skip to number 8.

Face the stack and the top of the rep gets harder. Face away and the stretch gets harder, which is a long head play, as the table above shows.

7. Wide-Grip EZ-Bar Curl

The internet’s number one short head exercise is number seven here.

You probably came for this move. It sits at 7 for one reason: the grip width rule behind its reputation has never been tested, as covered above.

It still earns a slot. It loads heavy and progresses easily, and that matters more than any of this, because volume is the real lever.

Plenty of lifters feel it strongly in the inner arm, and feel is a legitimate reason to keep an exercise even when its story is not.

• Grip the outer angled sections of an EZ-bar, wider than shoulder width.
• Keep your elbows in line with or slightly in front of your hips.
• Curl and lower under control, lighter than you expect until it stops feeling awkward.

Use an EZ-bar, not a straight bar. A wide grip on a straight bar reliably generates wrist pain.

The verdict: keep it if you like it. Just do not believe it is doing something to your inner arm that a preacher curl is not.

8. Resistance Band Spider Curl

The position that matters does not require any of the equipment above.

No gym, no bench, no cable. A band and a wall reproduce the shoulder-flexed position from numbers 1 through 4. Same lever, lighter load.

• Stand on the middle of the band and lean into a wall so your arms hang in front of you.
• Curl the handles with a supinated grip, upper arms still.
• Lower slowly against the band’s pull instead of letting it snap back.

Need it harder? Double the band up or widen your stance. Both shorten its working length and raise tension.

A band is hardest at the top of the curl, where it is stretched furthest. A dumbbell is easiest there, which makes bands a good complement to free weights, not a substitute.

Two bodyweight options if you have something to hang from. Ring curls approximate an elbow-only curl. Chin-ups load your biceps with a big slice of your bodyweight, but your lats and mid-back work hard too, so they isolate least.

Best for home training and travel. Your main option if it is all you have, a finisher if it is not.

FAQs

Is the short head the inner or outer part of your bicep?

Inner. The short head sits on the inside of your upper arm, so it is the half that fills out your arm width when someone looks at you from the front. The long head sits on the outside and gives you the peak.

Can you actually isolate the short head of your bicep?

No. Both heads run off the same nerve, and both bend your elbow and turn your palm up, so no curl switches one of them off. You can lean the balance slightly with shoulder position, but that is a lean, not isolation.

Do wide grip curls really target the short head?

Nobody has tested it. No study has ever measured whether curl grip width changes which head does the work, so the rule is an assertion rather than a finding. Wide grip curls are still fine to do, just not for that reason.

Why do preacher curls hurt my elbow?

Usually the wrist position or the specific machine, not the exercise. Keep your wrist neutral with your knuckles in line with your forearm, and swap a straight bar for an EZ-bar or dumbbells. If one machine hurts, try a different one.

How long does it take to get wider arms?

Months, not weeks. Visible width comes from adding total arm mass, which is slow work, so think in training blocks rather than sessions. Your total arm size and where your biceps insert shape the look far more than which curl you pick.

Bottom Line

The short head bicep exercises on this list are worth doing. The rule that brought you here is not a finding, it just got repeated until it sounded like one.

Arm width comes from total biceps mass, and total biceps mass comes from curling hard, often enough, for long enough. Exercise selection is a small dial. Volume is the big one.

If you want a plan, take three moves and stop shopping. An EZ-bar preacher curl, a dumbbell supinating curl, and whichever option you can actually get to, twice a week, 3 sets each.

Give it months rather than weeks. Your arms will not know which head you were aiming at, and by the time they change, you will not care.