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Dumbbell Lying Supination

The Dumbbell Lying Supination primarily targets your Forearms. It requires dumbbell and is best suited to intermediate lifters.

Intermediate level · Equipment: Dumbbell · Isolation · Pull

Primary muscles: Forearms

How to perform Dumbbell Lying Supination

  1. Step 1. Lie sideways on a flat bench with one arm holding a dumbbell and the other hand on top of the bench folded so that you can rest your head on it.
  2. Step 2. Bend the elbows of the arm holding the dumbbell so that it creates a 90-degree angle between the upper arm and the forearm.
  3. Step 3. Now raise the upper arm so that the forearm is parallel to the floor and perpendicular to your torso (Tip: So the forearm will be directly in front of you). The upper arm will be stationary by your torso and should be parallel to the floor (aligned with your torso at all times). This will be your starting position.
  4. Step 4. As you breathe out, externally rotate your forearm so that the dumbbell is lifted up in a semicircle motion as you maintain the 90 degree angle bend between the upper arms and the forearm. You will continue this external rotation until the forearm is perpendicular to the floor and the torso pointing towards the ceiling. At this point you will hold the contraction for a second.
  5. Step 5. As you breathe in, slowly go back to the starting position.
  6. Step 6. Repeat for the recommended amount of repetitions and then switch to the other arm.

Frequently asked questions

Which specific muscles does the dumbbell lying supination target?

This isolation exercise primarily targets the supinator muscle and the brachioradialis. It focuses on the rotational strength of the forearm rather than elbow flexion.

What is the most effective way to position the arm for this movement?

Rest your forearm on a flat bench or your thigh with the wrist hanging slightly off the edge. Maintain a neutral spine and keep the elbow tucked to isolate the forearm rotation.

What is a common mistake to avoid during the rotation?

Avoid using momentum or swinging the shoulder to help turn the weight. Ensure the movement is slow and controlled, focusing entirely on the forearm pivoting the dumbbell.

How should a beginner progress if the dumbbell feels too heavy?

Start with a light PVC pipe or an unloaded hammer to master the mechanics. You can also choke up on the dumbbell handle to reduce the lever length and resistance.

What are the recommended sets and reps for forearm supination?

Perform 2 to 3 sets of 12 to 15 repetitions per arm. Use a higher rep range to prioritize muscular endurance and joint health in the wrist and elbow.

Sample sets & reps for Dumbbell Lying Supination

  • Strength accessory: 4 sets × 6-8 reps, 90s rest. 75-80% 1RM, RPE 7-8.
  • Hypertrophy: 3-4 sets × 8-12 reps, 60-90s rest. RPE 8, controlled tempo.
  • Metabolic stress: 3 sets × 15-20 reps, 30-45s rest. RPE 9, last set to failure with rest-pause.

Pick the scheme that matches your goal. Beginners should start at the lower end of every range; progress weight only when you hit the upper end of the rep range with one or two reps in reserve.

Related Forearms exercises

  • Bottoms-Up Clean From The Hang Position — kettlebell
  • Cable Wrist Curl — cable
  • Farmer's Walk — other
  • Finger Curls — barbell
  • Kneeling Forearm Stretch — stretch

See all Forearms exercises →

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