Dumbbell One Arm Reverse Spider Curl
- Target muscle
- —
- Equipment
- Dumbbell
- Body part
- Upper Arms
- Type
- Strength
The dumbbell one arm reverse spider curl is a strict, single-arm isolation exercise for the upper arms. Performed chest-down on an incline bench with the working arm hanging straight toward the floor, the reverse (pronated) grip biases the brachioradialis and forearm flexors while the biceps assist. The chest-supported position removes momentum, making it a precise way to build elbow-flexor and forearm strength and to even out left-to-right imbalances one side at a time.
How to do the Dumbbell One Arm Reverse Spider Curl
- 1Set an incline bench to roughly 45° and lie chest-down against the pad with your feet braced on the floor for stability.
- 2Hold a dumbbell in one hand and let that arm hang straight down from the shoulder, fully extended toward the floor.
- 3Take an overhand (pronated) grip so your palm faces back toward your body, with your wrist in a neutral, straight line.
- 4Keep your chest pinned to the pad and your upper arm vertical and locked in place throughout the set.
- 5Curl the dumbbell up by bending only at the elbow, keeping the back of your hand leading the movement.
- 6Squeeze the working muscles at the top, holding briefly without letting your upper arm drift forward.
- 7Lower the dumbbell slowly under control until the arm is fully extended again.
- 8Complete all reps on one arm, then switch the dumbbell to the other hand and repeat.
Form tips
- Keep your chest pinned to the pad and your upper arm locked vertical for the entire set so the only joint that moves is the elbow.
- Use a slow, controlled lowering phase; resisting the weight on the way down is where much of the work happens.
- Keep your wrist firm and straight so the load stays on the elbow flexors rather than rolling into your grip.
- Pick a lighter dumbbell than you would use for a standard curl, as the pronated grip and strict position make this deceptively hard.
Common mistakes
- Letting the upper arm swing forward to start the rep, which turns it into a shoulder movement and removes tension from the elbow flexors.
- Lifting the chest off the pad to heave the dumbbell up, which reintroduces body English and defeats the purpose of the chest-supported setup.
- Cutting the lowering phase short and dropping the weight, which wastes the most productive part of the curl and risks elbow strain.
- Not extending the arm fully at the bottom, which shortens the range of motion and limits strength gains.
Frequently asked questions
What muscles does the dumbbell one arm reverse spider curl work?
It trains the elbow flexors of the upper arm. The reverse (pronated) grip biases the brachioradialis and forearm flexors, with the biceps assisting, and the strict spider position keeps tension on them through a controlled range.
Why use a reverse grip instead of a regular curl grip?
The overhand (pronated) grip shifts more of the load onto the brachioradialis and forearm flexors and puts the biceps in a weaker position. This builds forearm and elbow-flexor strength that a standard supinated curl trains less directly.
What bench angle should I use for the spider curl?
Around 45° is standard. Lie chest-down against the pad so your arm hangs straight down from the shoulder, which fixes the upper arm and forces a strict curl.
Is this exercise good for beginners?
Yes. The chest-down position makes it almost impossible to cheat with body swing, so beginners learn strict form quickly. Start with a light dumbbell and focus on a slow lowering phase.
How many sets and reps should I do?
As an arm accessory, 2 to 4 sets of 10 to 15 reps per arm works well. Higher reps with a controlled tempo suit this strict, single-joint movement better than heavy low-rep work.
