WhatWorksWhat.
Biceps

Chin-up

Even split between hard bicep contraction and lat squeeze under the armpit.

Complexity · Mediumcalisthenicsintermediate+Pull-up bar
Check Your Form
  • Abs
  • Biceps
  • Biceps - Inner biceps
  • Biceps - Outer biceps
  • Biceps - Underneath biceps
  • Lats
  • Rear delts
  • Rhomboids
  • Outer biceps
  • Inner biceps
  • Underneath biceps
  • Forearm peak

PrimarySecondary

What it hits

Parts of the target muscle.

  • Outer biceps

    Hit

    Long head - recruited more with elbows behind the body.

  • Inner biceps

    Hit

    Short head - recruited more with elbows in front of the body.

  • Underneath biceps

    Hit

    Brachialis - pushes the bicep up. Loves neutral grip.

  • Forearm peak

    Not hit

    Brachioradialis - recruited with pronated or hammer grip.

The movement

Get it right, not roughly right.

Optimal form

5:48· OmarIsuf

PULL UP VS CHIN UPS: What Builds More MUSCLE?

Chin-up start position hanging from a pull-up bar with an underhand grip and arms extended.
Start
Chin-up finish position with chest close to the bar and elbows driven down and back.
Finish

Underhand grip, hands shoulder-width. Hang fully, then pull the chest to the bar by driving the elbows down and back. Lower with control to a full hang.

Common mistakes

  • Kipping for free reps - turns it into a shoulder/grip exercise.
  • Stopping at chin-touches-bar instead of chest-touches-bar.

Where you should feel it

Even split between hard bicep contraction and lat squeeze under the armpit.

Injury risk · 2/10

SafetyIf you can't pull yourself up yet, do slow eccentrics - don't kip. Kipping trades shoulder safety for free reps.

Progression

Step back, or step up.

Same movement family, different rung. Harder versions sit above, easier versions below — tap a rung to land there.

  1. Progress toWeighted chin-upBelt or vest - once bodyweight reps move easily.
  2. You're hereChin-up
  3. Step back toLat pulldownSame pull path, assisted load you can dial in.
  4. Step back toSlow eccentric chin-upJump up, lower for 5 seconds - builds the strength to pull yourself up.

Variations

Same movement, moved emphasis.

Ranked by how directly each variation still trains biceps. 80%+ means the target barely changes. Below 60%, the emphasis has meaningfully shifted — useful for variety, but less precise for the specific part. The label calls it at a glance.

  • Neutral grip pull-up

    Palms facing each other.

    75% on target

    Slight shift

    More brachialis, less direct bicep peak.

  • Wide pronated pull-up

    Palms forward, wide.

    30% on target

    Off target

    Lats dominate, biceps assist.

Compare with another exercise

Cool-down

Worked it. Walk it back down.

A couple of minutes here pays back in soreness avoided tomorrow. Browse the full library.

  • Lat Hang

    Dead hang from a bar, fully relaxed shoulders. 30–60s. Decompresses everything pulling-related.

    LatsRhomboids

  • Child's Pose

    Knees wide, big toes together. Sit hips back to the heels, arms long overhead, forehead to the floor. 60s. Walk the hands one direction to bias one side.

    LatsLower backRhomboids

  • Cobra Pose

    Lying face-down, hands under the shoulders. Press the chest up by extending the back. Hips stay on the floor. 30s. Antidote to a long day of crunches and sitting.

    AbsFront deltsChest

Evidence