Arnold Dumbbell Press
Also works: Triceps
A seated dumbbell press that starts with the palms facing you at chin height and rotates them 180 degrees on the way up. The rotation adds range at the bottom and drags the front delt through a longer stretch than a standard press, at the cost of load and of an internally rotated shoulder position that not every joint tolerates.
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 a bench upright, or one notch off vertical, with your back flat against the pad.
- Kick the dumbbells up to your shoulders one knee at a time rather than curling them into place.
- Start with palms facing you, dumbbells at upper-chest height, elbows tucked in front of your ribs — the top of a curl.
- Plant both feet flat and squeeze your glutes so the bench is a backrest, not a launch pad.
- Take a breath and brace before the first rep; you want the ribcage stacked over the pelvis, not flared.
Every rep
Breathing & tempo — Inhale at the bottom with the palms facing you, exhale through the press and rotation, and reset the breath each rep. Two seconds up with the rotation spread across the whole ascent, a brief pause at lockout, three seconds down.
Before you load it
- If your shoulder pinches at the point where the palms turn outward, stop. That mid-range internal rotation is a known impingement position, and a neutral-grip dumbbell press trains the same muscles without it.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Take whatever you use for a strict seated dumbbell press and drop 20-30% — for most people that means starting at 8-14 kg per hand. Progress when you can complete all reps with the rotation finished before the elbows pass shoulder height, then add 2 kg per hand. Chasing weight here rewards a shortened range and a late twist.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Cut the weight by a third and practise reps where the rotation is finished by the time the elbows reach shoulder height. The two motions must overlap — pressing then twisting loads the joint at the worst moment.
Start 20-30% lighter. The longer range and the rotation both cost you leverage, and forcing the old weight is how the elbows flare and the lower back arches.
Keep your ribs pulled down and your glutes tight, and end the set at the last rep your back stays flat. If you want to press with leg drive and an arch, do a standing push press deliberately instead of a sloppy seated one.
Lower until the dumbbells are at chin level with the palms facing you and the elbows in front of your ribs. Film one set from the side to check where you are actually stopping.
Why bother
A normal dumbbell press starts with the upper arms already at roughly 90 degrees of abduction. The Arnold starts lower and in front, with the elbows tucked and the palms facing the chest, so the anterior deltoid begins the rep in a longer position. More range under load in the stretched position is one of the better-supported drivers of hypertrophy, and that is the honest case for this variation.
The rotation itself is not the magic. Turning the palms outward as you press means the shoulder passes through internal rotation while abducting, which is exactly the position that provokes impingement in people with cranky shoulders. If your shoulder pinches at the halfway point, that is not something to press through — it is information.
Where it fits
As the main dumbbell press on a shoulder or push day, 3-4 sets of 8-12, or as a second press after a heavy barbell overhead press. You cannot load it like a strict press, so use it in the 8-12 range and get your heavy pressing elsewhere. Twice a week at most.
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 the Arnold press actually better than a regular dumbbell press?
Better for anterior delt range and stretch, worse for load and for anyone with a sensitive shoulder. If you can do both pain-free, the Arnold makes a good hypertrophy press and the standard press makes a better strength press. If you have to pick one, pick the one your shoulder likes.
Does the rotation hit the medial or rear delt?
Barely. The rotation is happening at the shoulder joint, not adding meaningful frontal-plane abduction, so the medial delt contribution is similar to any overhead press and the rear delt gets almost nothing. If you want side and rear delts, do lateral raises and face pulls — this is a front-delt press.
Should I do it seated or standing?
Seated. The rotation makes the dumbbells harder to control and standing adds a balance task that limits load before the shoulders are done. Standing also invites a leg-drive cheat that ruins the slow, deliberate rotation the movement depends on.
My shoulder clicks during the twist. Should I keep going?
Painless clicking is common and generally fine. Pinching, a sharp catch, or an ache that lingers into the next day is not — swap to a neutral-grip dumbbell press and revisit the Arnold once the shoulder settles.