Short Head Bicep Exercises: Best Picks by the Evidence

What the short head does

Short head bicep exercises are curls done with your upper arm in front of your body, finished with a full palm-up turn. The short head starts at the coracoid process, a hook of bone at the front of the shoulder blade, while the long head starts at the top of the shoulder socket. A 2017 narrative review of biceps anatomy and function describes both heads joining one tendon on the radius, and calls the biceps an elbow flexor and a powerful forearm supinator.

The short head forms the inner part of the front of the arm. Because the long head runs over the top of the shoulder, bringing the arm forward shortens it relative to the short head, which is why coaches expect the short head to do relatively more in these curls. That is reasoning from anatomy, not measured growth.

The two heads do respond differently to arm position. In a lab study of 15 young men using shear-wave elastography, a measure of passive stiffness at rest, the short head was most stretched with the arm out to the side and rotated inward, and the long head with the arm back. The pillar page on what the research says about the best biceps exercises covers the whole muscle, and the biceps exercise hub lists every curl.

The short head bicep exercises worth your sets

Preacher-style curls lead because the pad fixes your arm in front of you and takes body swing out of the lift. A 12-week MRI trial in 21 untrained adults shows they build the biceps well, as the next section explains. Concentration and spider curls keep the arm forward with a different resistance profile, and they are easy to do one arm at a time.

Barbell and EZ-bar curls rank fourth because they let you add weight for years, with the palms fully turned up. Cable curls fill in volume when your elbows want a smoother pull. None of these isolates the short head; for the arm-behind-the-body side of the muscle, see the long head bicep exercises guide.

Preacher curls and the short head: what the MRI study found

The best data on the preacher curl comes from the MRI trial above, which trained one arm with preacher curls and the other with incline curls. Preacher curls grew the brachialis 21.1% and the brachioradialis 17.6%, against 17.1% and 13.5% with incline curls. Biceps volume still rose 18.9% with preacher curls, slightly less than the 22.1% from incline curls, and total elbow-flexor growth was close (19.2% vs 17.6%).

So the preacher curl's measured edge was in the muscles under and beside the biceps, not in a short head that the scans never separated. That makes it a strong pick if you also want a bigger brachialis, which lies under the biceps and adds to arm thickness. An 8-week trial in 63 young women found preacher curls added slightly more elbow-flexor thickness near the elbow, a mean difference of 0.10 cm, or about 1 mm.

Why does the preacher curl feel hardest at the bottom? The pad angles your upper arm forward, so the weight's lever is longest early in the rep, soon after your elbow leaves the straight position. In an 8-week trial in 19 untrained women, training only the bottom half of a dumbbell preacher curl grew the lower biceps more than training only the top half.

The resistance profile is not decisive, though. In a 10-week trial in 35 untrained young adults, cable and barbell preacher curls, which load the biceps hardest at opposite ends of the range, grew it similarly (7% vs 8%). A 10-week trial in 15 untrained men found cable preacher curls produced similar biceps growth to cable curls with the arm behind the body.

Grip width and supination: what is known

Supination, turning the palm up, is the part of the curl most specific to the biceps. A study of two cadaver arms plus a computer model found the biceps' elbow-flexion lever is larger when the forearm is supinated. In a lab study of 20 people, adding supination effort during maximal elbow flexion tended to raise biceps EMG, while pronation effort shifted activity toward the brachioradialis.

The two heads do not always work equally either. A small EMG study of 16 people found their relative activity during rapid supination changed with joint position, with a lengthened biceps shifting activity toward the long head. These are EMG and lever studies, not growth trials. EMG tracks the electrical signal during a task, and a 2022 review of EMG as a growth proxy judged that signal an unvalidated predictor of long-term hypertrophy.

The practical point is modest: keep your palm fully up on most curls. Grip width is where claims outrun the data. The popular rule, wide grip for the short head and narrow grip for the long head, has no peer-reviewed EMG or growth study behind it that this guide could find, so treat it as unsupported. Use the width that keeps your wrists and elbows comfortable, and switch to an EZ-bar if a straight bar strains your wrists.

Can you isolate the short head?

No. Both heads pull on one tendon, so any curl trains both, plus the brachialis. Even the preacher curl loads the long head hard: an EMG study of 22 trained men recorded long-head activity of about 80% of maximum at the start of a preacher curl, falling later in the lift.

Concentration curls show what EMG can and cannot tell you. In a repeated-measures EMG study of 15 adults using light loads, concentration curls produced the highest biceps EMG of four common curls and hammer curls the lowest, and the group ranking held across four sessions. That shows concentration curls work the biceps hard, not that they grow more muscle, and about one-third of participants ranked the curls less consistently.

The incline inner biceps curl is often sold as a short-head isolator. You lie back on an incline bench and curl with your arms out to the sides, which puts the arm behind and away from the body. By anatomy, that position should stretch both heads rather than one. Treat it as variety, not isolation; like spider and concentration curls, it has no growth trial.

Sets, reps and weekly volume

Hard sets for the whole biceps matter more than which head you aim at. A 2017 meta-analysis of 34 treatment groups from 15 studies tied extra weekly sets per muscle to extra growth, rising in graded steps. Pooling 67 studies, a 2026 meta-regression found growth kept rising with sets but with shrinking returns, and little evidence that training a muscle more often adds growth once weekly volume is equal. It credited indirect work, such as pulldowns for the biceps, at half a set, a counting method that fit best rather than a measured fact.

Plan 6 to 10 direct curl sets a week, mostly 8 to 15 reps, and add 2 sets when your numbers stall and recovery is fine. A 2022 meta-analysis of 15 studies found training to failure was not required for growth or strength and did not harm either. So stop most sets 1 to 2 reps short, and take the last set of a machine or cable curl to failure when you want.

Rate effort with the RPE chart, and see sets per muscle per week for counting curls next to back work. If you log in Trainer, it records each set, suggests the next weight and totals your weekly sets per muscle.

Technique cues for the top picks

Preacher curl

• Set the seat so your armpit sits snug against the top of the pad.
• Keep the back of your upper arm flat on the pad for the whole set.
• Lower under control to a nearly straight elbow; never bounce out of the bottom.
• On a machine, line your elbow up with the machine's pivot.

Concentration curl

• Sit, lean forward and brace the back of your upper arm against your inner thigh.
• Start from a straight elbow and curl toward your shoulder.
• Turn your little finger up hard at the top to finish the supination.
• Keep your torso still; only the forearm moves.

Spider curl

• Lie chest-down on a bench set to about 45 degrees, arms hanging straight down.
• Curl without letting your elbows swing back toward the bench.
• Pause for a second near the top, then lower slowly.

One cue helps all three: think about squeezing the biceps, not just moving the weight. In an 8-week trial in 30 untrained men, those told to focus on squeezing the target muscle gained more elbow-flexor thickness (12.4% vs 6.9%) than those told to focus on moving the weight. Use it as a helpful cue, not a requirement.

Regressions and progressions

The bottom-half option draws on the 8-week partial-range preacher trial, which compared two partial ranges and never tested full reps, so use partials only after your full-range reps. To progress, bring every set to the top of its rep range, then make the smallest weight jump. Progressive overload explained and the progressive overload calculator show how.

A sample short-head-focused arm session

Do this 10-set session once a week, on its own or after a pull day. If you train arms twice a week, run this session once and the long-head session once, each cut to 5 or 6 sets, so you cover both arm positions. For a full arm day with triceps, use the arm workout, and the bicep curl variations guide compares more curls.

Common mistakes

• Lifting your elbow off the preacher pad to finish a rep, which turns it into a loose standing curl.
• Bouncing out of the bottom of a preacher curl. Control the stretch; if you feel sharp pain at the front of the elbow, stop and see a qualified clinician.
• Curling with a half-turned palm on every exercise, which hands more work to the forearm muscles.
• Changing grip width to target one head when no good evidence supports it.
• Judging a curl by the burn or by EMG claims instead of by load and reps in your log.
• Dropping arm-behind-the-body curls entirely. Incline curls build the biceps too, so rotate positions.

What the research cannot tell you yet

Lists of bicep short head exercises, this one included, rest on anatomy and EMG rather than head-specific growth data.

• No growth study measures the short and long heads separately.
• In the MRI trial, preacher curls favored the brachialis and brachioradialis, not a separately measured short head.
• No growth trial has tested spider curls or concentration curls.
• No peer-reviewed EMG study of wide- versus narrow-grip curls was found, so grip-width claims for the short head are unsupported.
• Most curl trials used untrained people for 8 to 12 weeks, so results in experienced lifters are uncertain.