Exercise guide
Dumbbell Lying Pronation On Floor
- Intermediate
- Isolation
- Rep-based
- Back
- Chest
- Upper arms
This isolation exercise targets the pronator teres and pronator quadratus muscles in the forearm, which are responsible for rotating the palm downward. Performing this on the floor provides a stable base that eliminates shoulder momentum, ensuring maximum tension on the forearm rotators.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Lie flat on your back on a mat with your knees bent and feet flat for stability.
- Hold a dumbbell in one hand and bend your elbow to 90 degrees, pinning your upper arm against the floor and your ribcage.
- Start with your palm facing up (supinated) so the dumbbell is held horizontally across your body.
How to do it
- Exhale as you slowly rotate your forearm inward, turning your palm toward the floor until the dumbbell is vertical.
- Hold the peak contraction for one second, feeling the muscles on the inside and top of your forearm engage.
- Inhale as you slowly rotate the dumbbell back to the starting palm-up position using a controlled 3-second eccentric tempo.
- Complete all repetitions on one arm before switching to the other side.
Form checklist
- Keep your elbow glued to the floor and your side throughout the entire set.
- Ensure the rotation occurs at the elbow/forearm, not by tilting the wrist.
- Keep your shoulder blade retracted and flat against the floor to prevent compensation.
- Maintain a firm, full grip on the dumbbell handle to maximize muscle irradiation.
Pro tips
- Grip the dumbbell 'choked up' toward the top bell (thumb side) to create an offset weight distribution, which increases the torque and difficulty of the pronation.
- Focus on the mind-muscle connection by imagining you are pouring water out of a jug to initiate the rotation.
Make it harder
- Add a 2-second isometric hold at the end-range of the rotation (palm down).
- Use a sledgehammer or a resistance band looped around the thumb side of the dumbbell to increase the rotational resistance.
Frequently asked
- What muscles does the dumbbell lying pronation on floor work?
- The dumbbell lying pronation on floor primarily targets the forearms, and also works the biceps and triceps as secondary muscles.
- What equipment do you need for the dumbbell lying pronation on floor?
- The dumbbell lying pronation on floor uses dumbbell.
- Is the dumbbell lying pronation on floor good for beginners?
- The dumbbell lying pronation on floor is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.