Education · Upper legs

Hip flexion

Target Hip flexors  ·  Equipment Body weight  ·  Level Beginner  ·  Reps 4

Hip flexion is a beginner-level education movement targeting the hip flexors, written in Posecode, a small open-source language that capable language models can use to describe human movement as text. Authored joint targets and reach-IK solves are constrained to Posecode's configured per-axis bounds. Those bounds constrain the visualization, but they do not certify that a complete movement is safe or clinically correct. This page documents a code example; it is not exercise instruction.

Movement phases

Phase cues are display-only coaching text. The executable joint and contact directives in the source below determine the animation.

1. Lift2.5s · flow Raise the straight right leg forward: sagittal-plane hip flexion
2. Lower2.5s · settle Lower the leg back under the hip

The .posecode source

This is the exact text used by the linked playground animation: phases and joint angles, not 3D transforms.

posecode stretch "Hip flexion (ROM demo)"
  rig humanoid
  pose start = standing

  step "Lift" 2.5s flow:
    hip_right: flex 90
    pin: foot_left floor
    cue "Raise the straight right leg forward: sagittal-plane hip flexion"

  step "Lower" 2.5s settle:
    hip_right: flex 0
    ground-lock: foot_left
    reach: foot_right floor
    cue "Lower the leg back under the hip"

  repeat 4

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