Functional · Upper legs

Step-up

Target Quadriceps  ·  Equipment Box  ·  Level Intermediate  ·  Reps 6

Step-up is a intermediate-level functional movement targeting the quadriceps, 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. Plant the foot1s · ease-in-out Plant the right foot up on top of the box
2. Drive up1.2s · ease-out Drive through the top foot to stand tall on the box
3. Step down1.4s · ease-in Lower the trailing foot back to the floor
4. Off the box0.8s · ease-out Step the lead foot down to meet it, standing tall on the floor

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 "Step-up"
  rig humanoid
  prop box
  pose start = standing

  step "Plant the foot" 1s ease-in-out:
    hip_right: flex 70
    knee_right: flex 90
    cue "Plant the right foot up on top of the box"

  step "Drive up" 1.2s ease-out:
    hip_right: flex 8
    knee_right: flex 8
    hip_left: flex 35
    knee_left: flex 45
    pin: foot_right box
    cue "Drive through the top foot to stand tall on the box"

  step "Step down" 1.4s ease-in:
    hip_right: flex 70
    knee_right: flex 90
    hip_left: flex 0
    knee_left: flex 0
    pin: foot_right box
    cue "Lower the trailing foot back to the floor"

  step "Off the box" 0.8s ease-out:
    hip_right: flex 0
    knee_right: flex 0
    ground-lock: feet
    cue "Step the lead foot down to meet it, standing tall on the floor"

  repeat 6

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