How to Do One-Arm Flat Bench Dumbbell Flye
Start and end of one clean rep of One-Arm Flat Bench Dumbbell Flye.
Quick facts
| Primary muscle | Chest |
|---|---|
| Secondary muscles | — |
| Equipment | Dumbbell |
| Category | Strength |
How to perform One-Arm Flat Bench Dumbbell Flye
- Lie down on a flat bench with a dumbbell in one hand resting on top of your thigh. The palm of your hand with the dumbbell in it should be at a neutral grip.
- By using your thighs to help you get the dumbbell up, clean the dumbbell so that you can hold it in front of you with your lifting arm being fully extended. Remember to maintain a neutral grip with this exercise. Your non lifting hand should be to the side holding the flat bench for better support. This will be your starting position.
- Your arm with the weight should have a slight bend on your elbow in order to prevent stress at the biceps tendon. Begin by lowering your arm with the weight in it out in a wide arc until you feel a stretch on your chest. Breathe in as you perform this portion of the movement. Tip: Keep in mind that throughout the movement, your lifting arm should remain stationary; the movement should only occur at the shoulder joint.
- Return your lifting arm back to the starting position as you squeeze your chest muscles and breathe out. Tip: Make sure to use the same arc of motion used to lower the weights.
- Hold for a second at the contracted position and repeat the movement for the prescribed amount of repetitions.
- Switch arms and repeat the exercise.
Muscles worked
- Chest (primary): pushes the arms forward and across the body — your horizontal pressing power.
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.
- Warm up the pattern with a couple of lighter, submaximal sets before your working sets.
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 Flat Bench Dumbbell Flye work?
One-Arm Flat Bench Dumbbell Flye is a focused movement that primarily works the chest.
What equipment do I need for One-Arm Flat Bench Dumbbell Flye?
One-Arm Flat Bench Dumbbell Flye needs a pair of dumbbells.
How many sets and reps should I do for One-Arm Flat Bench Dumbbell Flye?
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 Flat Bench Dumbbell Flye with a coach in your pocket
Gimmy is your AI gym buddy — it programs One-Arm Flat Bench Dumbbell Flye into recovery-aware workouts, tracks your sets, and shows one score that tells you if it's working.
Get early access