Fitness · Core

Mountain climber

Target Abdominals  ·  Equipment Body weight  ·  Level Intermediate  ·  Reps 8

Mountain climber is a intermediate-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. Right knee in0.5s · ease-out Drive the right knee toward the chest
2. Switch0.5s · ease-in-out Switch fast: left knee drives in
3. Out0.5s · ease-in Return to a strong plank

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 "Mountain climber"
  rig humanoid
  pose start = plank

  step "Right knee in" 0.5s ease-out:
    hip_right: flex 60
    knee_right: flex 75
    ground-lock: hands, feet
    cue "Drive the right knee toward the chest"

  step "Switch" 0.5s ease-in-out:
    hip_right: flex 0
    knee_right: flex 0
    hip_left: flex 60
    knee_left: flex 75
    ground-lock: hands, feet
    cue "Switch fast: left knee drives in"

  step "Out" 0.5s ease-in:
    hip_left: flex 0
    knee_left: flex 0
    ground-lock: hands, feet
    cue "Return to a strong plank"

  repeat 8

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