{
  "schemaVersion": "1.0.0",
  "exerciseSlug": "clamshell",
  "assetId": "clamshell-preview-shaos-v1",
  "role": "preview",
  "status": "approved",
  "version": "v1.0.0",
  "reviewedAt": "2026-09-03",
  "source": {
    "canonicalArtwork": "/assets/exercises/clamshell/anatomy.webp",
    "sha256": "1a6ca0b907770d7ce8d926611869c1340fe71a842e1e698f404383da9e7b0a03"
  },
  "production": {
    "method": "Identity-preserving key poses registered to a fixed side-lying body, feet, and canvas and arranged into a seamless standard-tempo loop.",
    "highlightCue": "Illustrative ShaOS activation cue; not an EMG measurement.",
    "highlightLegend": {
      "scheme": "primary-secondary",
      "primary": { "label": "Primary muscles", "color": "#D97706", "muscles": ["Glutes"] },
      "secondary": { "label": "Secondary muscles", "color": "#8F969B", "muscles": [] }
    },
    "principle": "Keep the side-glute cue visible at rest, build as the top knee opens, peak at the controlled top position, and ease during return."
  },
  "playback": { "width": 720, "height": 720, "durationSeconds": 6, "frameRate": 20, "muted": true, "loop": true },
  "files": {
    "preview": { "path": "preview.mp4", "mimeType": "video/mp4", "bytes": 444668, "sha256": "91b3fc70f89b3f5c91f85ade901e7431aa5cd597393c06770b9236de44916e2d" },
    "poster": { "path": "poster.webp", "mimeType": "image/webp", "bytes": 19086, "sha256": "b2b414d01a6dceb50f8732477e92323f413c73c6d8f0a9a28e082d4c6b302653" }
  }
}