Which Muscles Does the One Arm Dumbbell Press Work?

It's often said that knowledge is power and this adage happens to apply to pursuits involving both brains and brawn. For example, when you're trying to create the most effective workout plan to build muscle, learning about the benefits of a variety of exercises is helpful. Identifying the target muscles of an exercise such as the one-arm dumbbell press can help you figure out whether the exercise is going to be an effective use of your time or a wasted effort. Always ask your doctor before starting any workout routine.

  1. Primary Target

    • The primary target of the one-arm dumbbell press is your anterior deltoid, a muscle located on the front of your shoulder. This muscle provides the force needed to lift your arm and it also assists rotation and abduction, which is the movement of the arm away from your body. If you play sports such as basketball or volleyball, you'll find that strengthening this muscle can help enhance the power of your shots.

    Assisting Muscles

    • While the anterior deltoid provides the bulk of the force in the one-arm dumbbell press, other muscles provide assistance. These include other shoulder muscles, such as the lateral deltoid and supraspinatus; arm muscles such as the triceps; the trapezius, which is located in the back; the pectorals, or chest muscles; and the obliques. Additionally, your hip flexors, formally known as the psoas major, also help provide force to push the dumbbell upward. The wide range of assisting muscles involved in the one-arm dumbbell press makes it an efficient exercise for working more than one area of your body.

    Stabilizing Muscles

    • Whenever you perform a one-arm or one-leg exercise, your body may be a bit off-balance. To prevent your body from wasting energy by rocking back and forth, stabilizing muscles help you hold the dumbbell steady. During the one-arm dumbbell press, the muscles performing this task include your biceps and triceps, which are located on the front and back of your upper arm, respectively.

    Tips

    • The one-arm dumbbell press can be an effective exercise, but it's not ideal for everyone. By making slight modifications, you can change the focus of the exercise. For example, if you don't want to work your obliques and hip flexors, perform the exercise while sitting down instead of standing. If you want to enhance the activity of your hip flexors and obliques during the exercise, perform it while standing on one leg. Use a spotter when doing this for added safety.