Lying Supine Dumbbell Curl
The lying supine dumbbell curl has you flat on your back on a bench, curling dumbbells up toward your shoulders. Lying down removes the ability to swing your torso or drive your elbows forward to help the lift, so the biceps handle nearly the entire movement on their own. It's a straightforward option for anyone who wants a strict curl variation without needing a preacher bench or cable stack.
Why it works
A standing dumbbell curl gives you room to lean back slightly or swing your elbows forward as the weight gets heavy, both of which let momentum help move the dumbbell instead of your biceps doing all the work. Lying flat on a bench takes that room away: your torso and shoulders are pressed against a fixed surface, so the biceps are the only muscle group that can flex your elbow and raise the weight. That strict setup makes it a reliable way to isolate the biceps, especially for lifters who tend to cheat a standing curl once the reps get hard.
Set up
- Lie flat on your back on a bench, feet planted on the floor or bench for stability.
- Hold a dumbbell in each hand with your arms extended down toward the floor on either side of the bench.
- Keep your upper arms close to your torso as your starting position.
- Brace your shoulders against the bench so they can't shift during the set.
How to do it
- Curl the dumbbells up toward your shoulders, bending only at the elbow.
- Keep your upper arms still, close to your sides, throughout the movement.
- Squeeze your biceps briefly at the top of the curl.
- Lower the dumbbells back down under control to a full arm extension.
- Avoid letting the dumbbells swing or drift away from your sides.
- Repeat for the full set at a controlled, even pace.
Form cues
- Elbows stay pinned to your sides.
- Curl comes from the elbow, not the shoulder.
- Squeeze the biceps at the top.
- Lower with control, don't let the weight drop.
Breathing: Exhale as you curl the dumbbells up, inhale as you lower them back down.
Common mistakes
Letting the elbows drift forward or away from the torso during the curl.
Fix: Keep your upper arms pinned to your sides for the whole set, moving only from the elbow joint.
Using a weight heavy enough that the shoulders roll forward to help lift it.
Fix: Drop the weight until your shoulders can stay flat against the bench through every rep.
Rushing the lowering phase and letting the dumbbells drop.
Fix: Take at least as long lowering the weight as you did curling it up; the controlled negative is part of the work.
How to program it
- Three sets of 10 to 12 reps is a solid dose for building bicep strength and size, since this is a lighter isolation movement rather than a heavy compound lift.
- It works well as one of the first exercises in an arm-focused session, since the strict setup rewards fresh muscles over fatigued ones.
- Most lifters can train biceps like this twice a week without issue, given how quickly a small isolation movement like this recovers.
- Add reps toward 15 before increasing the dumbbell weight, since strict elbow position matters more here than how much you're lifting.
Safety notes
- Keep the dumbbells under control on both the lift and the lowering phase; letting them drop can strain the elbow joint.
- If you feel the movement in your shoulders instead of your biceps, lighten the load and reset your upper arm position against your sides.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
How many reps should I do for the lying supine dumbbell curl?
Three sets of 10 to 12 reps is a good starting point. Move toward 15 reps before adding weight, since strict elbow position matters more here than heavy load.
Lying dumbbell curl vs standing dumbbell curl, what's the difference?
The lying version pins your shoulders and torso against a bench, removing any chance to swing or lean into the lift. The standing version needs no bench and is quicker to set up, but it's easier to cheat with momentum as the reps get harder.
Can I do this curl without a bench?
Yes, lying flat on the floor works the same way. You'll lose a small amount of range at the bottom since the floor stops your arm sooner than a bench edge would, but the movement pattern stays the same.
Why do my shoulders hurt during lying dumbbell curls?
This usually means the weight is heavy enough that your shoulders are rolling forward to help the lift. Lighten the dumbbells and keep your shoulder blades pressed flat against the bench throughout the set.
Is the lying dumbbell curl better than a standing curl for building biceps?
Neither is strictly better; they train the same muscle with a different level of strictness. The lying version removes almost every way to cheat the lift, which makes it a good check on your form, while the standing version is quicker to set up and lets you use slightly more weight since your whole body can help stabilize it.