What muscles does the Arnold Press work?

Mainly the front delts. It also works the abs, traps and triceps.

What equipment do you need for the Arnold Press?

It uses dumbbells. Without it, the Barbell Overhead Press and the Bradford/Rocky Presses train the same muscles the same way.

GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Band Overhead Press.

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A seated dumbbell press that starts with the palms facing you and rotates them forward as the weight goes overhead.

Set an adjustable bench upright and sit with your back flat against the pad.
Bring two dumbbells to shoulder height with your palms turned toward your face and your elbows in front of you.
Brace your core and keep your ribs down before the first rep.
Press the dumbbells overhead while rotating your forearms so the palms finish facing forward.
Stop just short of locking the elbows and hold the top position briefly.
Reverse the rotation as you lower the dumbbells back to the start.

Rushing the rotation, which turns the lift into a swing and takes tension off the deltoid.
Letting the ribs flare and the lower back arch, which moves load from the shoulders to the spine.
Locking the elbows hard at the top, which parks the load on the joint instead of the muscle.
Starting with the palms already facing forward, which removes the rotation the exercise exists for.

What muscles does the Arnold Press work?: Mainly the front delts. It also works the abs, traps and triceps.
What equipment do you need for the Arnold Press?: It uses dumbbells. Without it, the Barbell Overhead Press and the Bradford/Rocky Presses train the same muscles the same way.
Is the Arnold Press good for beginners?: GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Band Overhead Press.