Chin-Up: Muscles Worked and How to Do It
TL;DR
Chin-ups work your lats as the prime mover, pulling your shoulders down and back to lift your bodyweight. Your biceps bend the elbow through the pull, your forearms grip the bar throughout, and your middle back draws your shoulder blades together as you finish each rep.
- Primary muscle:
- Lats
- Secondary muscles:
- Biceps, Forearms, Middle back
Muscles worked
Your lats (latissimus dorsi) are the biggest mover in a chin-up, pulling your upper arms down toward your torso to lift your body. The underhand grip lines up well with how the lats pull, which is why chin-ups tend to feel easier than pull-ups for most lifters.
Your biceps work hard through every rep because the underhand grip puts your elbow flexors in a strong position to assist the pull, more so than in a pull-up. Your forearms grip the bar isometrically for the whole set, and your middle back (rhomboids and mid-traps) squeezes your shoulder blades together as you pull your chin over the bar.
Log Chin-Up in PR Streak
PR Streak's library has 873 exercises, each with photos and step-by-step instructions like this one. Log this move and see what you lifted last time right next to every set, with every PR caught automatically and a chart for every exercise.
How to do it
- Grab the pull-up bar with the palms facing your torso and a grip closer than the shoulder width.
- As you have both arms extended in front of you holding the bar at the chosen grip width, keep your torso as straight as possible while creating a curvature on your lower back and sticking your chest out. This is your starting position. Tip: Keeping the torso as straight as possible maximizes biceps stimulation while minimizing back involvement.
- As you breathe out, pull your torso up until your head is around the level of the pull-up bar. Concentrate on using the biceps muscles in order to perform the movement. Keep the elbows close to your body. Tip: 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 of squeezing the biceps in the contracted position, slowly lower your torso back to the starting position; when your arms are fully extended. Breathe in as you perform this portion of the movement.
- Repeat this motion for the prescribed amount of repetitions.
Form tips
- Start from a dead hang with your arms fully extended and shoulder blades relaxed.
- Pull your elbows down and back rather than just bending your arms.
- Drive your chest toward the bar and finish with your chin clearing it.
- Lower yourself under control instead of dropping from the top.
- Use a resistance band or an assisted machine if you can't yet do a full rep.
Exercise details
| Equipment | Bodyweight |
|---|---|
| Level | Beginner |
| Mechanic | Compound |
Used by lifters following PPL, 5x5, upper/lower, and more.
Frequently Asked Questions
Are chin-ups easier than pull-ups?
Most lifters can do more chin-ups than pull-ups because the underhand grip recruits the biceps more directly and lines up well with how the lats pull. Pull-ups use an overhand grip that shifts more work to the upper back and rear shoulders, making the biceps assist less.
How many chin-ups should I be able to do?
There's no universal number since it depends on your bodyweight and training history. Instead of chasing a rep count, train in the range that matches your goal: 6 reps or fewer with added weight for strength, or 6-12 controlled reps for muscle size.
What if I can't do a single chin-up yet?
Build the movement with an assisted pull-up machine, resistance bands looped over the bar, or slow negatives where you jump to the top and lower yourself over several seconds. Combining these with rows, like the dumbbell row, builds the pulling strength chin-ups need.
More lats exercises
Exercise instructions and photos come from the free-exercise-db library, public domain, the same library used inside the PR Streak app.
