How to Do One Arm Chin-Up
Start and end of one clean rep of One Arm Chin-Up.
Quick facts
| Primary muscle | Back |
|---|---|
| Secondary muscles | Biceps, Forearms |
| Equipment | Machine |
| Category | Strength |
How to perform One Arm Chin-Up
- For this exercise, start out by placing a towel around a chin up bar.
- Grab the chin-up bar with your palm facing you. One hand will be grabbing the chin-up bar and the other will be grabbing the towel.
- Bring your torso back around 30 degrees or so while creating a curvature on your lower back and sticking your chest out. This is your starting position.v
- Pull your torso up until the bar touches your upper chest by drawing the shoulders and the upper arms down and back. Exhale as you perform this portion of the movement. Tip: Concentrate on squeezing the back muscles once you reach the full contracted position. The upper torso should remain stationary as it moves through space and only the arms should move. The forearms should do no other work other than hold the bar.
- After a second on the contracted position, start to inhale and slowly lower your torso back to the starting position when your arms are fully extended and the lats are fully stretched.
- Repeat this motion for the prescribed amount of repetitions.
- Switch arms and repeat the movement.
Muscles worked
- Back (primary): pulls the arms down and toward the torso and keeps the spine stable.
- Biceps (secondary): bends the elbow and turns the palm up during pulls and curls.
- Forearms (secondary): controls your grip and keeps the wrist steady under load.
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
- Start each rep by pulling the shoulder blades in first, then drive with the elbows — think of pulling with the elbows, not the hands.
- Set the seat and pads so the machine's pivot lines up with the joint you're training before your first rep.
- Treat every rep the same — a repeatable setup and bar path is what lets you add weight safely over time.
- Control the lowering phase — a 2–3 second descent builds more than dropping the weight.
Common mistakes
- Yanking with the arms and forgetting the back, so the biceps give out before the target muscle does.
- Leaving the seat or range on a setting that forces the joint into an awkward angle.
- Chasing weight jumps before the current load feels solid on every rep.
Frequently asked questions
What muscles does One Arm Chin-Up work?
One Arm Chin-Up mainly works the back, with the biceps, forearms helping as secondary movers.
What equipment do I need for One Arm Chin-Up?
One Arm Chin-Up needs the corresponding weight-stack or plate-loaded machine.
How many sets and reps should I do for One Arm Chin-Up?
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.
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