Fitness · Upper arms

Biceps curl

Target Biceps  ·  Equipment Body weight  ·  Level Beginner  ·  Reps 10

Biceps curl is a beginner-level fitness movement targeting the biceps, 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. Curl1.1s · ease-out Curl up, keep the elbows tucked at your sides
2. Lower1.4s · ease-in Lower under control: don't swing

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 "Biceps curl"
  rig humanoid
  pose start = standing

  step "Curl" 1.1s ease-out:
    elbows: flex 135
    cue "Curl up, keep the elbows tucked at your sides"

  step "Lower" 1.4s ease-in:
    elbows: flex 15
    cue "Lower under control: don't swing"

  repeat 10

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