Floor Dumbbell Forearm Supination
In SetGrip: Dumbbell Forearm Supination (Floor)
Flat on your back with elbows pinned at your sides, the floor keeps supination strict: shoulder blades and upper arms simply cannot move. Rotating the dumbbells palm-up from this position keeps all the twist in the forearm. Because the elbow stays fixed at your side, the biceps assist less than they do in the chest-down bench version.
How to do the Floor Dumbbell Forearm Supination
- Lie flat on your back on the floor with your legs extended and your arms by your sides, holding a dumbbell in each hand.
- Rotate your palms to face up, keeping your elbows close to your sides.
- Slowly curl the dumbbells towards your shoulders, squeezing your forearms.
- Pause for a moment at the top, then slowly lower the dumbbells back down to the starting position.
- Repeat for the desired number of repetitions.
Tip: Use high reps, 15 to 25, and a light weight you can move through the full range with control.
Muscles worked
Common mistakes
- Moving the elbow — the forearm should rest on the bench or your thigh and only the hand should turn; if the elbow lifts, you are using the biceps.
- Rushing through the range — go slowly and pause at each end so the small forearm muscles do the work rather than momentum.
- Going too heavy — these movements use small muscles, so a light dumbbell or plate is plenty; the goal is a burn, not a max.
- Bar rolling off the fingertips — on finger curls let it go to the second knuckle and no further, then curl it back into the palm.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Muscle growth | 3–4 × 10–15 | 60–90 s |
| Endurance / finisher | 2–3 × 15–20 | 45 s |
| Strength | Not ideal — pick a compound lift for the same muscle | — |
Forearm work goes at the very end of a session after all gripping is done. Superset finger curls with reverse wrist curls using the same bar.
Variations and alternatives
Frequently asked questions
What muscles does the Floor Dumbbell Forearm Supination work?
The Floor Dumbbell Forearm Supination primarily works the forearms. It also involves the biceps and delts, which assist the movement and stabilise the joints.
Is the Floor Dumbbell Forearm Supination good for beginners?
Yes. The Floor Dumbbell Forearm Supination is rated beginner: it uses a dumbbell and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Floor Dumbbell Forearm Supination?
If you cannot do the Floor Dumbbell Forearm Supination, try the Bench Dumbbell Forearm Supination, the Floor Dumbbell Forearm Pronation or the Bench Dumbbell Forearm Pronation. Each of them trains the forearms through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Floor Dumbbell Forearm Supination, a sensible starting point is muscle growth: 3–4 × 10–15 with 60–90 s rest; endurance / finisher: 2–3 × 15–20 with 45 s rest. Do it after your compound lifts. It is a finishing movement, not the main event.
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