On trial: Arnold press vs. dumbbell shoulder press: what's the difference between standard dumbbell shoulder presses and the Arnold presses that the Austrian Oak popularized?
by Jim Stoppani
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FACTS OF THE CASE
* Arnold presses Sit on a low straightback bench with your feet firmly planted on the floor and hold a pair of dumbbells at shoulder height. Begin with your palms facing your shoulders and your elbows down and forward. Push the weights straight up, pronating your hands (turn your wrists out) once the dumbbells reach eye level so that your palms face forward at full arm extension. Control the dumbbells in the reverse motion all the way back down to the start position.
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* Dumbbell overhead presses Sit on a low straight-back bench with your feet firmly planted on the floor and hold a pair of dumbbells at shoulder height. Begin with your palms facing forward and your elbows just below shoulder level. Push the weights straight up, stopping just short of locking out your elbows. Then control the dumbbells all the way down until your upper arms are parallel to the floor or slightly lower, with the weights at approximately ear level.
THE EVIDENCE When doing standard dumbbell presses, you maximize the involvement of the medial deltoids. This is due to the fact that you bring your arms out perpendicular to the sides of your body in the bottom position. This motion better stimulates the side delts while minimizing the stimulation of the front delts. On the other hand, when performing Arnold presses, you start with your arms in front of your body. The more forward your arms, the more the front delts are involved and the less the side delts work. Therefore, Arnold presses better stimulate the front delts while decreasing stimulation of the side delts. The first half of the movement also involves the upper pecs.
THE VERDICT To better hit the medial delts, focus on doing standard overhead presses. To better hit the anterior (front) delts, as well as the upper pecs a bit, focus on doing Arnold presses. Most bodybuilders want more side delt development, as it increases shoulder width and roundness. Since front delts are hit during most incline chest exercises, few bodybuilders are lacking in the front delt department. Therefore, most bodybuilders would be better off sticking primarily with standard dumbbell overhead presses to build greater side delt mass. Those of you who do need to bring up your front delts should incorporate Arnold presses into your workouts.
--Jim Stoppani, PhD
Told ya