{
  "$schema": "https://openexercise.org/schema/v0/exercise.json",
  "aliases": [
    {
      "text": "Butterfly Narrow Grip",
      "kind": "common"
    },
    {
      "text": "Narrow-Grip Butterfly",
      "kind": "common"
    },
    {
      "text": "Close-Grip Pec Deck Fly",
      "kind": "common"
    },
    {
      "text": "Close-Grip Machine Fly",
      "kind": "common"
    }
  ],
  "anatomy": {
    "muscles": [
      {
        "muscle": "pectoralis-major-sternal",
        "role": "prime-mover"
      },
      {
        "muscle": "pectoralis-major-clavicular",
        "role": "synergist"
      },
      {
        "muscle": "deltoid-anterior",
        "role": "synergist"
      },
      {
        "muscle": "serratus-anterior",
        "role": "synergist"
      },
      {
        "muscle": "coracobrachialis",
        "role": "synergist"
      },
      {
        "muscle": "biceps-short-head",
        "role": "stabilizer"
      }
    ],
    "joints": [
      {
        "joint": "glenohumeral",
        "actions": [
          "horizontal-adduction",
          "horizontal-abduction"
        ]
      },
      {
        "joint": "scapulothoracic",
        "actions": [
          "protraction",
          "retraction"
        ]
      },
      {
        "joint": "elbow",
        "actions": [
          "isometric-stabilization"
        ]
      }
    ]
  },
  "classification": {
    "modalities": [
      "hypertrophy",
      "strength"
    ],
    "movement_patterns": [
      "isolation-chest-fly",
      "horizontal-push"
    ],
    "mechanics": "isolation",
    "force": "push",
    "kinetic_chain": "open",
    "laterality": "bilateral",
    "planes": [
      "transverse"
    ],
    "contraction": [
      "dynamic"
    ],
    "level": "beginner"
  },
  "equipment": {
    "required": [
      [
        "selectorized-machine",
        "plate-loaded-machine"
      ]
    ]
  },
  "external_ids": {
    "wger": "137"
  },
  "id": "oec:close-grip-machine-chest-fly",
  "instructions": {
    "setup": [
      "Adjust the seat height so the machine handles align horizontally with mid-chest level.",
      "Sit back firmly against the backrest with your feet planted flat on the floor.",
      "Grasp the inner or narrow handle attachments with a neutral grip and maintain a slight bend in your elbows."
    ],
    "steps": [
      "Engage your chest and pull the handles together in a smooth arc until your hands nearly touch in front of your sternum.",
      "Squeeze your pectoral muscles intensely at peak contraction for a brief pause.",
      "Slowly reverse the movement under control, allowing your chest to open until you feel a comfortable stretch without letting the weight stack touch down."
    ],
    "breathing": "Exhale as you bring the handles together; inhale as you slowly return to the stretched starting position.",
    "cues": [
      "Lead with your elbows, not your hands.",
      "Keep your chest high and shoulders pinned back.",
      "Squeeze the chest at the center."
    ],
    "common_faults": [
      {
        "fault": "Allowing the shoulders to shrug or roll forward at the end of the press.",
        "correction": "Keep your shoulder blades retracted and depressed against the backrest throughout the movement."
      },
      {
        "fault": "Overextending the arms backward and hyperextending the shoulder capsule.",
        "correction": "Stop the eccentric phase when your elbows are roughly in line with your torso, feeling tension in the chest rather than the shoulder joint."
      },
      {
        "fault": "Letting the weight plates crash between repetitions.",
        "correction": "Maintain continuous muscular tension by stopping just short of the weight stack resting."
      }
    ],
    "safety": {
      "precautions": [
        "Do not set the starting arm range too far back if you have a history of anterior shoulder instability."
      ],
      "spotter": "not-needed"
    }
  },
  "measurement": {
    "load": {
      "convention": "weight-stack",
      "implements": 1,
      "kind": "external"
    },
    "profiles": [
      {
        "required": [
          "reps",
          "load"
        ],
        "optional": [
          "rpe"
        ]
      }
    ],
    "records": {
      "e1rm": true,
      "volume": true
    },
    "reps_counted": "total"
  },
  "name": "Close-Grip Machine Chest Fly",
  "previous_ids": [
    "oec:butterfly-narrow-grip"
  ],
  "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: Butterfly Narrow Grip",
        "url": "https://wger.de/en/exercise/137/view-base",
        "license": "CC-BY-SA-3.0",
        "author": "wger.de"
      }
    ]
  },
  "relations": [
    {
      "type": "variation-of",
      "target": "oec:machine-chest-fly"
    },
    {
      "type": "substitute-for",
      "target": "oec:machine-chest-fly"
    },
    {
      "type": "substitute-for",
      "target": "oec:seated-cable-fly"
    },
    {
      "type": "substitute-for",
      "target": "oec:cable-chest-fly"
    }
  ],
  "setup": {
    "grip": {
      "orientation": "neutral",
      "width": "narrow"
    },
    "position": "seated",
    "range": "full",
    "stance": {
      "kind": "parallel",
      "width": "hip"
    }
  },
  "status": "active",
  "summary": "An isolation exercise performed seated on a fly machine using a narrow handle grip to target the pectoral muscles through horizontal adduction."
}