Controlled Forearm Pronation and Supination
A standing single-dumbbell drill that rotates the forearm from palm-up to palm-down with the elbow fixed.
How to do it
- Stand tall with a light dumbbell in one hand and the opposite arm relaxed at your side.
- Pin the working upper arm to the torso and bend the elbow to about 90 degrees.
- Hold the handle at its center with the wrist straight and the thumb pointing up.
- Rotate the forearm until the palm faces down, keeping the elbow glued to the waist.
- Reverse the rotation until the palm faces up, still without moving the upper arm.
- Finish the set, then switch hands and repeat.
Key technique cue
Pin the elbow to your side and rotate the forearm only; keep the wrist straight.
Common mistakes
- ✕ Letting the elbow drift forward, which turns the drill into a curl.
- ✕ Bending or extending the wrist, which loads the flexors instead of the rotators.
- ✕ Using a heavy dumbbell that forces the shoulder to swing the weight around.
- ✕ Snapping through the end ranges instead of slowing the last third of each turn.
Benefits
- ✓ Trains the forearm rotators that gripping, throwing, and racquet work actually use.
- ✓ A light dumbbell and a fixed elbow make the drill usable in rehab-adjacent programming.
- ✓ Unilateral loading shows side-to-side differences without a cable stack.
About the exercise
Forearm pronation and supination is rotation of the radius around the ulna, not a wrist curl and not a biceps curl. The working upper arm stays pinned to the side, the elbow stays near 90 degrees, and a light dumbbell turns from thumb-up through palm-down and palm-up. The pronator teres and pronator quadratus drive one direction; the supinator drives the other. Slow end ranges matter more than load, because the lever is short and the elbow is the hinge that must stay quiet.
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