The chin-up is a pull-up with your palms facing you, and the change of grip puts the biceps in a much stronger position — which is why almost everyone can do more chin-ups than pull-ups and why it is usually the first bodyweight pull anyone manages. The lats still do most of the work; you have simply given them a better-placed helper.
How to do it
- Underhand grip about shoulder width — this brings the biceps in alongside the lats.
- Keep the ribs down rather than arching to get your chin over.
Common mistakes
- Treating it as a biceps exercise and letting the shoulders shrug up at the bottom.
What it trains
- Lats
- pull the upper arms down past the torso — still the prime mover despite the grip
- Biceps
- bend the elbow from their strongest position, which is the whole reason chin-ups feel easier
- Upper back
- retracts the shoulder blades as your chest approaches the bar
- Core
- stops the legs swinging and keeps the rep honest
Variations and alternatives
Common questions
Are chin-ups a back exercise or a biceps exercise?
Both, genuinely. The lats move the most weight but the biceps get a heavier stimulus than any curl you would do in the same session. If you train chin-ups hard twice a week, you can cut your direct biceps work substantially and lose nothing.
How do I get from zero chin-ups to one?
Slow negatives are the fastest route: jump or step to the top, then take five seconds to lower. Three or four singles at the end of a back session, twice a week, plus assisted reps for volume. The strength shows up in weeks, not months.
How do I add weight to chin-ups?
A dip belt with a plate hanging from it, or a dumbbell between your feet. Once you can do about 12 clean bodyweight reps, adding 2.5 kg and dropping back to 6 progresses faster than chasing 20. StackUp tracks the added weight the same as any other lift, so the mark still tells you when to add.
In StackUp. Logged as reps per set. Add weight if you use a belt or a dumbbell and StackUp progresses it like any other lift. Get the app.
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