Fitness · Core

Crunch

Target Abdominals  ·  Equipment Body weight  ·  Level Beginner  ·  Reps 12

Crunch is a beginner-level fitness movement targeting the abdominals, 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. Curl up1s · ease-out Curl the shoulders off the floor, ribs toward the hips
2. Lower1.2s · ease-in Lower the upper back down with control

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 "Crunch"
  rig humanoid
  pose start = supine

  step "Curl up" 1s ease-out:
    knees: flex 90
    spine: flex 30
    chest: flex 20
    neck: flex 20
    shoulders: flex 45
    ground-lock: feet
    cue "Curl the shoulders off the floor, ribs toward the hips"

  step "Lower" 1.2s ease-in:
    knees: flex 0
    spine: flex 0
    chest: flex 0
    neck: flex 0
    shoulders: flex 0
    ground-lock: feet
    cue "Lower the upper back down with control"

  repeat 12

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