{
  "$schema": "https://openexercise.org/schema/v0/exercise.json",
  "aliases": [
    {
      "text": "Floor Skull Crusher",
      "kind": "common"
    },
    {
      "text": "Dead-Stop Skull Crusher",
      "kind": "common"
    },
    {
      "text": "EZ-Bar Floor Triceps Extension",
      "kind": "common"
    },
    {
      "text": "Floor Lying Triceps Extension",
      "kind": "common"
    }
  ],
  "anatomy": {
    "muscles": [
      {
        "muscle": "triceps-brachii",
        "role": "prime-mover"
      },
      {
        "muscle": "anconeus",
        "role": "synergist"
      },
      {
        "muscle": "forearm-flexors",
        "role": "stabilizer"
      },
      {
        "muscle": "deltoid-anterior",
        "role": "stabilizer"
      }
    ],
    "joints": [
      {
        "joint": "elbow",
        "actions": [
          "extension",
          "flexion"
        ]
      },
      {
        "joint": "glenohumeral",
        "actions": [
          "isometric-stabilization"
        ]
      },
      {
        "joint": "wrist",
        "actions": [
          "isometric-stabilization"
        ]
      }
    ]
  },
  "classification": {
    "modalities": [
      "hypertrophy",
      "strength"
    ],
    "movement_patterns": [
      "isolation-elbow-extension"
    ],
    "mechanics": "isolation",
    "force": "push",
    "kinetic_chain": "open",
    "laterality": "bilateral",
    "planes": [
      "sagittal"
    ],
    "contraction": [
      "dynamic"
    ],
    "level": "intermediate"
  },
  "equipment": {
    "optional": [
      "mat",
      "weight-plate"
    ],
    "required": [
      [
        "ez-bar",
        "barbell"
      ]
    ]
  },
  "external_ids": {
    "wger": "1468"
  },
  "id": "oec:ez-bar-floor-skull-crusher",
  "instructions": {
    "setup": [
      "Lie flat on your back on the floor or an exercise mat, with knees bent and feet flat on the ground.",
      "Hold an EZ-bar above your upper chest or forehead with an overhand grip on the inner bends, arms extended."
    ],
    "steps": [
      "Lower the bar under control by bending at the elbows until the weight plates gently touch the floor overhead behind your head.",
      "Allow the weight to come to a brief, dead-stop pause on the floor without letting tension leave the triceps completely.",
      "Drive the weight back up by extending your elbows until your arms return to the starting position."
    ],
    "breathing": "Inhale as you lower the bar to the floor, and exhale as you press back up to full extension.",
    "cues": [
      "Keep upper arms stationary",
      "Dead stop on the floor, no bouncing",
      "Drive through the triceps"
    ],
    "common_faults": [
      {
        "fault": "Bouncing the plates off the floor to gain momentum.",
        "correction": "Pause completely on the floor to eliminate the stretch reflex before extending."
      },
      {
        "fault": "Flaring the elbows outward excessively during the press.",
        "correction": "Keep the elbows tucked shoulder-width apart and pointing toward the ceiling throughout the repetition."
      }
    ],
    "safety": {
      "precautions": [
        "Ensure standard-sized plates or bumpers are used if needed so the bar settles at an appropriate height overhead without risking facial contact."
      ],
      "spotter": "not-needed"
    }
  },
  "measurement": {
    "load": {
      "convention": "total",
      "implements": 1,
      "kind": "external"
    },
    "profiles": [
      {
        "required": [
          "reps",
          "load"
        ],
        "optional": [
          "rpe"
        ]
      }
    ],
    "records": {
      "e1rm": true,
      "volume": true
    },
    "reps_counted": "total"
  },
  "name": "EZ-Bar Floor Skull Crusher",
  "previous_ids": [
    "oec:floor-skull-crusher"
  ],
  "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: Floor Skull Crusher",
        "url": "https://wger.de/en/exercise/1468/view-base",
        "license": "CC-BY-SA-4.0",
        "author": "Expenses7000"
      }
    ]
  },
  "relations": [
    {
      "type": "variation-of",
      "target": "oec:ez-bar-skull-crusher"
    },
    {
      "type": "regression-of",
      "target": "oec:ez-bar-skull-crusher"
    },
    {
      "type": "substitute-for",
      "target": "oec:ez-bar-skull-crusher"
    },
    {
      "type": "substitute-for",
      "target": "oec:barbell-lying-triceps-extension"
    }
  ],
  "setup": {
    "grip": {
      "orientation": "pronated",
      "width": "narrow"
    },
    "position": "supine"
  },
  "status": "active",
  "summary": "A triceps extension performed lying supine on the floor, using the ground to pause between repetitions and reduce shoulder and elbow strain."
}