comparisons

Pullup vs Chinup: Which Builds More Back and Biceps?

What is a pullup?

A pullup uses a pronated grip with the palms facing away from you, hands set roughly shoulder width to slightly wider. You hang at full extension, then pull until your chin clears the bar. The back muscles do most of the work and the biceps assist. It is the gold-standard bodyweight back-builder and the harder of the two patterns for most people.

What is a chinup?

A chinup uses a supinated grip with the palms facing toward you, hands set roughly shoulder width. The motion is the same as a pullup, but the supinated grip puts the biceps in a far stronger pulling position. The biceps do meaningfully more of the work, which is why most people find chinups easier and can do more reps.

Which builds more back?

Both hit the lats hard. EMG studies of pulldowns and pullups generally find lat activation similar between the two grips, though pullups put the elbows in a slightly more abducted position that creates a longer lat stretch at the top of the rep. Pullups also recruit the lower trapezius and rhomboids more than chinups, because the wider grip and elbow path bias scapular retraction. If your goal is back width and that classic V-taper, pullups have a slight edge.

Which builds more biceps?

Chinups, clearly. Multiple EMG comparisons show 20 to 30% greater bicep brachii activation in chinups versus pullups. The supinated grip is the position where the biceps produce the most force, which is the same reason a barbell curl uses an underhand grip. If you want bigger arms from a single pulling movement, chinups are the better choice.

Which is harder?

Pullups are harder for almost everyone. The biceps lose mechanical advantage in the pronated grip and the lats have to absorb more of the lift. Most trainees can do 2 to 4 more chinups than pullups in a single set. If your max chinup is 10, your max pullup is probably 6 to 8.

This gap closes with training. As your back gets stronger, the chinup advantage shrinks.

Common mistakes

• Half reps: Cutting the range so the chin barely clears the bar, or stopping short of full extension at the bottom. Full range from a dead hang to a fully cleared chin is the standard.
• Kipping when you mean strict: Using leg momentum dilutes the training stimulus. Save kipping for conditioning work, not strength sets.
• Shrugged shoulders: Starting the pull with the shoulders up around the ears creates impingement risk. Initiate every rep by depressing the scapulae first.

How to program both

The cleanest setup runs both grips in the same week.

1. Day A: Pullups, 4 sets of 4 to 8 reps. Focus on full range and controlled tempo.
2. Day B: Chinups, 4 sets of 6 to 10 reps. Push closer to failure since the biceps recover faster than the back.
3. Run two pulling sessions per week, separated by at least 48 hours.
4. If you can only do one, do chinups while you're building base strength. Switch to pullups once you can hit 10 clean chinups in a single set.

Frequently asked questions

Are chinups easier than pullups?

Yes, for most people. The supinated grip puts the biceps in a stronger pulling position, so the bicep contributes more to the lift. Most trainees can do 2 to 4 more chinups than pullups in a single set.

Do pullups build bigger biceps than chinups?

No. Chinups recruit the biceps more than pullups because the supinated grip aligns the biceps for maximal force production. Multiple EMG studies show 20 to 30% greater bicep activation in chinups compared to pullups.

Which is better for lats, pullups or chinups?

Both hit the lats hard, but pullups produce a slightly wider lat stretch and shift more relative load to the upper back. For lat width specifically, pullups have a small edge.

Should beginners start with chinups or pullups?

Chinups. They are easier to perform with full range of motion and let you accumulate more practice volume earlier. Once you can do 8 to 10 clean chinups, transition some of your work to pullups.