Chin-Ups: The Complete Guide to the Underhand Pull-Up

What is a chin-up?

The chin-up is a bodyweight pulling exercise. You grab a fixed bar with your palms facing you, then pull until your chin clears the bar. In French it's called a traction en supination, an underhand pull-up.

That grip changes the mechanics of the pull. Your elbows travel down along your torso instead of flaring out to the sides. The arms contribute more, and the back works through a shorter path.

It's often the first strict pulling movement a lifter manages. Keep in mind, though, that chin-ups aren't an easy version of the pull-up: they simply target something else.

Underhand or overhand grip: what's the difference?

The difference comes down to forearm rotation. Underhand, your palms face you. Overhand, they face away, and the hands usually sit wider than shoulder width.

In practice the performance gap is obvious. Most lifters get 2 to 3 more reps with an underhand grip than an overhand one, at equal fatigue.

Which muscles do chin-ups work?

Chin-ups recruit the whole upper body, with a distinctive split across the muscles involved. The work centres on the vertical pulling chain.

• Latissimus dorsi: main driver of the movement
• Biceps brachii: heavily loaded in the shortened position
• Teres major and rhomboids: shoulder blade stabilisation
• Lower and mid traps: scapular rotation
• Core: pelvis control, legs held straight

The back muscles stay dominant despite the grip. EMG data shows lat activation close to what you see with an overhand grip, plus a clear bonus at the arms.

Someone who stalls at 3 overhand pull-ups will often hit 6 chin-ups the same day. That's not cheating: it's a lever for progress.

How to execute the movement

The starting position

Set your hands shoulder-width apart, palms facing you. Hang with arms straight and shoulders down, without letting your torso sag. Cross your ankles and squeeze your glutes to kill any swing.

Pulling up and lowering down

Drive your elbows down and back to bring your body up. Chin clears the bar, chest stays open. Lower over 2 to 3 seconds to full extension, without dumping the shoulders all at once.

Aim for 3 to 5 sets of 4 to 8 reps. Tempo beats rep count: one controlled rep is worth more than three swung with momentum. A library of filmed exercises helps you check your elbow angle during those first sessions.

Variations and progression for beginners

Not every variation suits every level. Start with an assisted version before going for the strict chin-up.

• Eccentric chin-up: step up on a bench, lower over 5 seconds
• Band-assisted chin-up: a band under the knees cuts the load
• Weighted chin-up: belt and plates once you hit 10 reps
• Close grip: hands together, emphasis on the biceps

Progression follows a simple logic: add one rep per week, then add weight. A doorway pull-up bar is enough to keep that pace at home. Building these cycles by hand takes time; our training programmes work out the sets and the load for you, session after session.

Try it for 14 days

Mistakes to avoid

The most common one is a partial range of motion. Stopping halfway cuts out the portion that does the most for your back. Come back down to straight arms on every rep.

Second mistake: unintentional kipping. If your hips start swinging, the force is no longer coming from the target muscles. Cut the reps rather than the technical standard.

Third mistake: neglecting your grip. A forearm that gives out before your back caps the whole session. Add dead hangs, 3 sets of 30 seconds at the end of your workout.

Barbell curl or chin-up: which one?

The curl isolates the arm, the chin-up trains the entire upper body. If you're short on time, the chin-up gives a better return: one exercise covers back, arms and core.

The curl still earns its place as an accessory, especially to add biceps volume without taxing the shoulders. The logical order is chin-ups early in the session, curls after. Compare the plans on the pricing page if you want to track this progression in the app.