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Pull-up

Target Lats  ·  Equipment Bar  ·  Level Advanced  ·  Reps 6

Pull-up is a advanced-level fitness movement targeting the lats, written in Posecode, a small open-source language that LLMs like ChatGPT, Claude, and Gemini can write to describe human movement as text. Every joint angle below is hard-clamped to a safe range of motion.

How to do it

1. Reach0.8s · ease-out Reach up and grip the bar
2. Hang0.7s · ease-in-out Hang from the bar, arms long, shoulders active
3. Pull up1.2s · ease-out Pull the chest toward the bar, driving the elbows down
4. Lower1.4s · ease-in Lower under control back to a full hang
5. Release0.8s · ease-in Drop off the bar and rest

The .posecode source

This is the exact text an LLM writes to produce the animation above: phases and joint angles, not 3D transforms.

posecode exercise "Pull-up"
  rig humanoid
  prop bar
  pose start = standing

  step "Reach" 0.8s ease-out:
    shoulders: flex 175
    elbows: flex 5
    ground-lock: feet
    cue "Reach up and grip the bar"

  step "Hang" 0.7s ease-in-out:
    shoulders: flex 175
    elbows: flex 5
    pin: hands bar
    cue "Hang from the bar, arms long, shoulders active"

  step "Pull up" 1.2s ease-out:
    shoulders: flex 150
    elbows: flex 130
    pin: hands bar
    cue "Pull the chest toward the bar, driving the elbows down"

  step "Lower" 1.4s ease-in:
    shoulders: flex 175
    elbows: flex 5
    pin: hands bar
    cue "Lower under control back to a full hang"

  step "Release" 0.8s ease-in:
    shoulders: flex 0
    elbows: flex 0
    ground-lock: feet
    cue "Drop off the bar and rest"

  repeat 6

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