Seated Dumbbell Inner Biceps Curl
A seated dumbbell curl in which the weights travel outward and up in a wide arc rather than straight along the ribs, forearms finishing in line with your outer deltoids and palms turned out. That flared path holds the shoulder in slight external rotation, which keeps the short head of the biceps under tension for longer than a straight-line curl does.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Sit on the end of a flat bench, feet planted wide enough that the dumbbells can swing outside your knees.
- Hold a dumbbell in each hand at arm's length with palms facing inward, thumbs forward.
- Sit tall with your shoulder blades pulled back — a rounded upper back kills the outward path.
- Keep the elbows lightly touching your ribs at the start, not flared yet.
- Choose a pair around 30-40% lighter than your straight seated curl. The arc is the load.
Every rep
Breathing & tempo — Exhale through the curl, inhale on the descent. Two seconds up along the arc, one second squeezed at the top, three seconds down — the slow lower is what keeps you on the wide path.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start with a 5-8 kg pair even if you curl much heavier in a straight line. Good looks like the dumbbells passing outside your knees on every rep and the palms turning fully out at the top. Add reps up to 15 before moving to the next pair, and step up only 2 kg at a time.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Watch the dumbbells in a mirror for the first few reps and keep them tracking outside your knees. If they cut inward, end the set — the variation has stopped existing.
Keep the upper arms roughly vertical and let the forearms do the flaring. Your elbow should stay near your ribs even while the hand travels wide.
Drop a third of the weight. The wide arc lengthens the lever at the hardest point of the rep, and forcing the old load just collapses the path back to a normal curl.
Drive the thumb away from your body as you lift and finish with the palm open to the ceiling. If you cannot, the weight is above what the rotation can control.
Why bother
Curling outward instead of forward changes what the shoulder is doing, not which muscle does the work. With the upper arm turned slightly out and the forearms swinging wide, the biceps works along a path it never meets on a straight-line curl, and you feel it on the inside of the upper arm. Be honest about the size of that: it is a shift in joint position and feel, not a switch that turns one head of the biceps on and the other off.
The arc is also its own difficulty. Moving the dumbbells laterally puts them further from your body's midline at ninety degrees of elbow flexion, so the moment arm is longer than in a standard curl and the sticking point bites harder. Expect to use noticeably lighter dumbbells and to feel the set in the inner arm rather than the biceps peak.
Where it fits
As a second or third curl variation, two to three sets of 10-15, after your heavier straight-line work is done. It is a shaping and finishing movement, not a strength one. Do not build a session around it — the wide arc caps the load too low to be a primary driver.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
Asked and answered
Is this the same as a wide-grip barbell curl?
Close, and the barbell version is harder to do badly. A bar fixes your hands at a set width, so the path cannot quietly collapse inward when the set gets hard — with dumbbells it usually does, somewhere around rep eight, and most people never notice. Take the barbell if you want load and a path you cannot cheat. Take the dumbbells if you want the palms to rotate fully outward at the top, which a fixed bar will not allow.
Why am I so much weaker on this than a normal curl?
Because the dumbbells sit further from your midline at the hardest point of the range, which lengthens the lever your biceps has to fight. A 30-40% drop is normal and expected. If the numbers match your straight curl, you have quietly stopped doing the arc.
Can I do this standing?
You can, but seated is better here. Standing gives you a hip drive to fall back on, and because the wide path is already hard to hold, that cheat arrives early. Sitting removes it and keeps the arc honest.
Is this worth doing if I already do incline curls?
Only as a variation, not as an addition to the same session. Incline curls stretch the long head; this one biases the short head. Rotating between them across a training block covers both, and running them back to back mostly adds fatigue.