Desk & posture · Chest

Chest opener

Target Pectorals  ·  Equipment Body weight  ·  Level Beginner  ·  Reps 4

Chest opener is a beginner-level desk & posture movement targeting the pectorals, 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. Open3s · ease-in-out Reach the arms back and lift the chest: open the front line
2. Release2.5s · ease-in-out Return to neutral, ribs stacked over the hips

The .posecode source

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

posecode stretch "Chest opener"
  rig humanoid
  pose start = standing

  step "Open" 3s ease-in-out:
    shoulders: extend 40
    chest: extend 18
    spine: extend 12
    ground-lock: feet
    cue "Reach the arms back and lift the chest: open the front line"

  step "Release" 2.5s ease-in-out:
    shoulders: extend 0
    chest: flex 0
    spine: flex 0
    ground-lock: feet
    cue "Return to neutral, ribs stacked over the hips"

  repeat 4

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