▸ Arms

Incline Inner Biceps Curl

BicepsDumbbell

beginner · isolation · strength

On an incline bench with the palms turned outward, you curl the dumbbells up and out in a wide arc so they finish beside your delts — the position of a front double biceps pose. The wide path keeps the arms externally rotated, which is what puts the emphasis on the short, inner head.

▸ How to

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 bench to 45 degrees and lie back with your head and upper back flat against the pad.
Let both dumbbells hang at arm's length beside you, then rotate the palms so they face away from your body.
Set the shoulder blades down and back and keep both feet on the floor.
Pick a weight you would use for a set of 15 standard incline curls — this arc is far weaker than it feels.

Every rep

Curl out and up in a wide arc, keeping the forearms roughly in line with your side delts rather than in front of your chest.

Hold the palms turned out the whole way; there is no rotation during the rep.

Finish with the dumbbells beside your shoulders in a double-biceps position and squeeze for a full second.

Return down the same wide path you came up — not straight down the front of your body.

Keep the elbows behind the line of your wrists so the front delt does not take over the arc.

Breathing & tempo — Exhale as you curl out and up, inhale on the way down. Two seconds up, one second squeezed at the top, three seconds down along the same arc.

▸ Programming

Sets, reps & load

Where to start, and what to change when it stops being hard.

Hypertrophy

3 sets of 10-15

Endurance

2-3 sets of 15-20

Roughly 60% of your usual incline curl — 5-8 kg per hand suits most trained lifters and 3-4 kg most beginners. Progress with reps and a longer squeeze, not weight: get three sets of 15 with the arc staying wide and the palms turned out, then add the smallest increment your gym has.

▸ Fix your form

What goes wrong

The errors that show up most often, and the cue that fixes each one.

Drifting the arc inward so it becomes an ordinary incline curl.

Watch that the dumbbells finish level with your ears and outside your shoulders. If they end up over your chest, halve the weight and rebuild the path.

Going too heavy because the incline curl weight is sitting right there.

Use around 60% of your normal incline curl load. This position is mechanically weak at the shoulder; the number on the dumbbell is not the measure here.

Letting the wrists roll inward as fatigue sets in.

Drive the little fingers up and out on every rep, and end the set when you can no longer hold the palms turned outward.

Shrugging the shoulders to lift the dumbbells the last few centimetres.

Keep both shoulder blades pinned to the pad and finish the rep where the biceps stops working, not where the traps can take it.

▸ The case for it

Why bother

The biceps short head runs on the inside of the upper arm and contributes most to the thickness you see from the front. Curling with the palms rotated out and the arms travelling wide rather than straight up keeps the forearm supinated and abducted, which biases that head instead of splitting the work evenly with the long head.

Nobody isolates one head of a two-headed muscle, and any page claiming otherwise is selling something. What this variation genuinely does is train elbow flexion in an arm path you never otherwise load — arms out to the sides rather than in front — and hold hard supination through the whole range. That is a real stimulus, just a modest one.

Where it fits

Use it late in an arm session, after your loaded curls, when a light weight and a long squeeze are what you can still do well. Two or three sets of 10-15, once or twice a week. It is not the movement to chase numbers on — the wide arc makes the shoulder the limiting factor before the biceps is.

▸ Swap it out

If this one isn't it

No kit, too hard, or too easy — here's where to go instead.

▸ Questions

Asked and answered

Can you actually target the inner head of the biceps?

You can bias it, not isolate it. Both heads share a tendon and both contract on every curl. Holding the arm abducted and the forearm strongly supinated shifts a modest amount of the demand toward the short head. Treat this as one useful variation among several rather than a shortcut to a specific arm shape.

Why is this so much weaker than a normal incline curl?

Because the wide arc moves the load far from your midline and asks the shoulder to stabilise an abducted arm through the whole set. The elbow flexors themselves are not weaker; the position is. Loading it like a standard curl just drags the front delt and traps in.

Does it need to be done on an incline?

The incline matters more than the name suggests: it lets both arms hang behind the torso so you cannot swing, and it holds the shoulder in a fixed position so the wide arc is repeatable. Standing, the same movement drifts into a swinging cheat curl within three reps.

Is this just the seated inner biceps curl on a bench?

Close, but the incline changes what the shoulder can do. Seated upright, your arms hang beside you and you can lean back a few degrees to help the wide arc along. On a 45-degree bench the arms start behind your torso and the pad stops you rocking, so the arc has to be produced by the elbow alone. Run whichever your gym has; do not count them as two separate movements in the same session.