Dumbbell Spider Curl
- Target muscle
- —
- Equipment
- Dumbbell
- Body part
- Upper Arms
- Type
- Strength
The dumbbell spider curl is a biceps isolation exercise performed lying chest-down on an incline bench so your arms hang straight toward the floor. With the upper arms fixed and momentum removed, it builds the biceps with help from the brachialis, making it a strict accessory for arm size and a strong peak contraction.
How to do the Dumbbell Spider Curl
- 1Set an incline bench to roughly 45° and lie chest-down against the pad with your feet planted for balance.
- 2Let your arms hang straight down off the top edge of the pad, holding a dumbbell in each hand with your palms facing forward.
- 3Brace your core and keep your shoulders down, away from your ears, so your upper arms stay vertical and still.
- 4Curl both dumbbells up toward your shoulders by flexing only at the elbows, keeping your upper arms locked in place.
- 5Squeeze the biceps hard at the top, holding the contracted position for a brief pause.
- 6Lower the dumbbells under control back to the fully extended hang, resisting the weight on the way down.
- 7Complete your reps, then set the dumbbells down safely before standing up.
Form tips
- Keep your upper arms perpendicular to the floor throughout the set so the elbows do all the work and the biceps stay under tension.
- Lower each rep with a slow, controlled tempo to make the eccentric portion count rather than dropping the weight.
- Supinate fully so your palms face up at the top, which maximizes the biceps contraction.
- Start lighter than you would on a standing curl — the strict position removes the body english that lets you cheat heavier weights up.
Common mistakes
- Swinging the dumbbells up with momentum, which shifts work off the biceps and defeats the strict purpose of the movement.
- Letting the upper arms drift forward or the shoulders roll in, which turns the curl into a partial front-raise and loses biceps tension.
- Cutting the range short by not fully extending at the bottom, robbing the biceps of the stretch and the lower half of the rep.
- Loading too heavy and using the legs or torso to heave the weight, which strains the elbows and removes the isolation.
Frequently asked questions
What muscles does the dumbbell spider curl work?
It isolates the biceps, with the brachialis assisting. Lying chest-down with the arms hanging vertically keeps the upper arms fixed, so the biceps do nearly all the work through a strict elbow flexion.
Why do a spider curl instead of a regular curl?
The chest-down position pins your upper arms and removes momentum, so you can't swing the weight up. That forces stricter form and a stronger peak contraction than a standing dumbbell curl, making it a good biceps finisher.
Is the dumbbell spider curl good for beginners?
Yes. It is easy to learn because the bench controls your position and stops you from cheating. Start with light dumbbells and focus on a full range of motion and a controlled lowering phase.
How many sets and reps should I do?
As an isolation accessory, 3–4 sets of 10–15 reps works well. Use a weight you can control through a full range with a brief squeeze at the top rather than maxing out.
