{
  "$schema": "https://openexercise.org/schema/v0/exercise.json",
  "aliases": [
    {
      "text": "isometric quad set",
      "kind": "common"
    },
    {
      "text": "quadriceps setting",
      "kind": "common"
    },
    {
      "text": "quad sets",
      "kind": "common"
    }
  ],
  "anatomy": {
    "muscles": [
      {
        "muscle": "vastus-medialis",
        "role": "prime-mover"
      },
      {
        "muscle": "vastus-lateralis",
        "role": "prime-mover"
      },
      {
        "muscle": "vastus-intermedius",
        "role": "prime-mover"
      },
      {
        "muscle": "rectus-femoris",
        "role": "prime-mover"
      }
    ],
    "joints": [
      {
        "joint": "knee",
        "actions": [
          "isometric-stabilization"
        ]
      }
    ]
  },
  "classification": {
    "modalities": [
      "rehabilitation",
      "strength"
    ],
    "movement_patterns": [
      "isolation-knee-extension"
    ],
    "mechanics": "isolation",
    "force": "static",
    "kinetic_chain": "open",
    "laterality": "unilateral",
    "planes": [
      "sagittal"
    ],
    "contraction": [
      "isometric"
    ],
    "level": "beginner"
  },
  "equipment": {
    "optional": [
      "mat"
    ],
    "required": []
  },
  "external_ids": {
    "wger": "2617"
  },
  "id": "oec:quad-set",
  "instructions": {
    "setup": [
      "Sit upright with your back supported or lie flat on your back on a firm, comfortable surface.",
      "Extend the target leg straight out in front of you with the toes pointing toward the ceiling.",
      "Keep the other leg comfortably relaxed or bent at the knee."
    ],
    "steps": [
      "Contract the quadriceps muscles on the front of your thigh, pressing the back of your knee down toward the floor.",
      "Focus on drawing your kneecap upward toward your hip as you sustain the contraction.",
      "Hold the maximal voluntary contraction for the prescribed duration.",
      "Gradually release the contraction and relax the thigh fully before starting the next repetition."
    ],
    "breathing": "Breathe continuously and evenly throughout the hold; do not hold your breath during the isometric contraction.",
    "cues": [
      "Press the back of the knee down",
      "Pull your kneecap toward your hip",
      "Squeeze the thigh tight"
    ],
    "common_faults": [
      {
        "fault": "Holding the breath during the isometric hold",
        "correction": "Maintain slow, steady breathing throughout each contraction."
      },
      {
        "fault": "Lifting the heel off the floor",
        "correction": "Keep the heel resting on the surface; focus on pressing the knee downward rather than lifting the leg."
      },
      {
        "fault": "Overusing the gluteal or hamstring muscles instead of the quadriceps",
        "correction": "Keep your buttocks relaxed and focus entirely on squeezing the muscles on the front of the thigh."
      }
    ],
    "safety": {
      "precautions": [
        "Perform smoothly without sharp, sudden contractions if recovering from acute knee surgery or injury"
      ],
      "spotter": "not-needed"
    }
  },
  "measurement": {
    "duration_counted": "per-side",
    "load": {
      "kind": "bodyweight"
    },
    "profiles": [
      {
        "required": [
          "reps",
          "duration"
        ],
        "optional": [
          "rpe"
        ]
      },
      {
        "required": [
          "reps"
        ],
        "optional": [
          "duration",
          "rpe"
        ]
      }
    ],
    "records": {},
    "reps_counted": "per-side"
  },
  "name": "Quad Set",
  "previous_ids": [
    "oec:quad-sets"
  ],
  "provenance": {
    "generated": [
      "/name",
      "/summary",
      "/classification",
      "/anatomy",
      "/equipment",
      "/measurement",
      "/instructions",
      "/setup",
      "/relations"
    ],
    "license": "CC-BY-SA-4.0",
    "review": {
      "status": "machine-generated",
      "model": "gemini-3.8-flash",
      "at": "2026-10-31"
    },
    "sources": [
      {
        "title": "wger: Quad Sets",
        "url": "https://wger.de/en/exercise/2617/view-base",
        "license": "CC-BY-SA-4.0",
        "author": "aboksz"
      }
    ]
  },
  "relations": [
    {
      "type": "regression-of",
      "target": "oec:band-terminal-knee-extension"
    },
    {
      "type": "regression-of",
      "target": "oec:isometric-leg-extension"
    },
    {
      "type": "regression-of",
      "target": "oec:leg-extension"
    },
    {
      "type": "variation-of",
      "target": "oec:isometric-leg-extension"
    }
  ],
  "setup": {
    "position": "supine"
  },
  "status": "active",
  "summary": "An isometric knee extension exercise performed seated or supine to activate and strengthen the quadriceps muscles."
}