How to Do One Arm Dumbbell Bench Press
Start and end of one clean rep of One Arm Dumbbell Bench Press.
Quick facts
| Primary muscle | Chest |
|---|---|
| Secondary muscles | Shoulders, Triceps |
| Equipment | Dumbbell |
| Category | Strength |
How to perform One Arm Dumbbell Bench Press
- Lie down on a flat bench with a dumbbell in one hand on top of your thigh.
- By using your thigh to help you get the dumbbell up, clean the dumbbell up so that you can hold it in front of you at shoulder width. Use the hand you are not lifting with to help position the dumbbell over you properly.
- Once at shoulder width, rotate your wrist forward so that the palm of your hand is facing away from you. This will be your starting position.
- Bring down the weights slowly to your side as you breathe in. Keep full control of the dumbbell at all times. Tip: Use the hand that you are not lifting with to help keep the dumbbell balance as you may struggle a bit at first. Only use your non-lifting hand if it is needed. Otherwise, keep it resting to the side.
- As you breathe out, push the dumbbells up using your pectoral muscles. Lock your arms in the contracted position, squeeze your chest, hold for a second and then start coming down slowly. Tip: It should take at least twice as long to go down than to come up.
- Repeat the movement for the prescribed amount of repetitions of your training program.
- Switch arms and repeat the movement.
Muscles worked
- Chest (primary): pushes the arms forward and across the body — your horizontal pressing power.
- Shoulders (secondary): raises and rotates the arms and drives everything overhead.
- Triceps (secondary): straightens the elbow to lock out every press and pushdown.
Sets & reps by goal
| Goal | Sets × reps | Load | Rest |
|---|---|---|---|
| Strength | 3–5 × 3–5 | Heavy (~85%+) | 2–3 min |
| Hypertrophy | 3–4 × 8–12 | Moderate (~65–75%) | 60–90 s |
| Endurance | 2–3 × 15–20 | Lighter (~50–60%) | 30–45 s |
Pick the row that matches your goal. If you're newer, anchor in the hypertrophy range while you groove the form.
Form tips
- Set the shoulder blades down and back and keep them pinned there so the chest, not the front of the shoulders, does the pressing.
- Each side works on its own, so match the depth and speed of both arms and don't let the stronger side take over.
- Treat every rep the same — a repeatable setup and bar path is what lets you add weight safely over time.
- Breathe out on the effort and in on the return, keeping one steady rhythm across the set.
Common mistakes
- Flaring the elbows straight out to the sides, which puts the shoulder joint in a weak, vulnerable spot.
- Letting the dumbbells drift apart or clang together at the top instead of controlling the path.
- Chasing weight jumps before the current load feels solid on every rep.
Frequently asked questions
What muscles does One Arm Dumbbell Bench Press work?
One Arm Dumbbell Bench Press mainly works the chest, with the shoulders, triceps helping as secondary movers.
What equipment do I need for One Arm Dumbbell Bench Press?
One Arm Dumbbell Bench Press needs a pair of dumbbells.
How many sets and reps should I do for One Arm Dumbbell Bench Press?
It depends on your goal: about 3–5 sets of 3–5 heavy reps for strength, 3–4 sets of 8–12 for muscle growth, or 2–3 sets of 15–20 for endurance. Pick the row that matches your goal. If you're newer, anchor in the hypertrophy range while you groove the form.
Train One Arm Dumbbell Bench Press with a coach in your pocket
Gimmy is your AI gym buddy — it programs One Arm Dumbbell Bench Press into recovery-aware workouts, tracks your sets, and shows one score that tells you if it's working.
Get early access