{
  "$schema": "https://openexercise.org/schema/v0/exercise.json",
  "aliases": [
    {
      "text": "Rotary Torso Machine",
      "kind": "common"
    },
    {
      "text": "Rotary Torso",
      "kind": "common"
    },
    {
      "text": "Machine Trunk Rotation",
      "kind": "common"
    },
    {
      "text": "Seated Rotary Torso",
      "kind": "common"
    }
  ],
  "anatomy": {
    "muscles": [
      {
        "muscle": "external-oblique",
        "role": "prime-mover"
      },
      {
        "muscle": "internal-oblique",
        "role": "prime-mover"
      },
      {
        "muscle": "rectus-abdominis",
        "role": "synergist"
      },
      {
        "muscle": "transversus-abdominis",
        "role": "stabilizer"
      },
      {
        "muscle": "multifidus",
        "role": "stabilizer"
      }
    ],
    "joints": [
      {
        "joint": "thoracic-spine",
        "actions": [
          "rotation"
        ]
      },
      {
        "joint": "lumbar-spine",
        "actions": [
          "rotation"
        ]
      }
    ]
  },
  "classification": {
    "modalities": [
      "hypertrophy",
      "strength"
    ],
    "movement_patterns": [
      "rotation"
    ],
    "mechanics": "isolation",
    "force": "not-applicable",
    "kinetic_chain": "open",
    "laterality": "unilateral",
    "planes": [
      "transverse"
    ],
    "contraction": [
      "dynamic"
    ],
    "level": "beginner"
  },
  "equipment": {
    "required": [
      [
        "selectorized-machine",
        "plate-loaded-machine"
      ]
    ]
  },
  "external_ids": {
    "wger": "1374"
  },
  "id": "oec:machine-torso-rotation",
  "instructions": {
    "setup": [
      "Adjust the seat height so that your chest or back pads align comfortably with your mid-torso.",
      "Set the range-of-motion pin to your starting side, allowing a comfortable rotational stretch without straining.",
      "Sit upright, brace your lower body against the thigh or knee pads, and lightly grip the handles."
    ],
    "steps": [
      "Engage your abdominal wall and brace your core.",
      "Smoothly rotate your torso across the centerline by contracting your obliques.",
      "Pause momentarily at the peak contraction without twisting your hips.",
      "Return under control to the starting position before the weight stack touches down."
    ],
    "breathing": "Exhale forcefully as you rotate against the resistance, and inhale smoothly as you return to the starting position.",
    "cues": [
      "Turn from the ribs, not the arms",
      "Lock your hips down",
      "Control the return"
    ],
    "common_faults": [
      {
        "fault": "Pulling or pushing through the arms and shoulders instead of rotating the core",
        "correction": "Relax the grip and focus on initiating and driving the movement entirely through the oblique muscles."
      },
      {
        "fault": "Allowing the hips and pelvis to slide or twist on the seat",
        "correction": "Firmly anchor your knees and pelvis against the pads to keep rotation localized to the torso."
      },
      {
        "fault": "Using momentum and letting the weight slam back",
        "correction": "Select a moderate load and perform slow, controlled repetitions with an emphatic pause at peak rotation."
      }
    ],
    "safety": {
      "precautions": [
        "Avoid using excessive loads or ballistic momentum to minimize shear stress on the lumbar spine.",
        "Do not force rotation past a comfortable active range of motion."
      ],
      "spotter": "not-needed"
    }
  },
  "measurement": {
    "load": {
      "convention": "weight-stack",
      "implements": 1,
      "kind": "external"
    },
    "profiles": [
      {
        "required": [
          "reps",
          "load"
        ],
        "optional": [
          "rpe"
        ]
      }
    ],
    "records": {
      "volume": true
    },
    "reps_counted": "per-side"
  },
  "name": "Machine Torso Rotation",
  "previous_ids": [
    "oec:rotary-torso-machine"
  ],
  "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: Rotary Torso Machine",
        "url": "https://wger.de/en/exercise/1374/view-base",
        "license": "CC-BY-SA-4.0",
        "author": "6LXBO"
      }
    ]
  },
  "relations": [
    {
      "type": "substitute-for",
      "target": "oec:cable-seated-trunk-rotation"
    },
    {
      "type": "variation-of",
      "target": "oec:cable-seated-trunk-rotation"
    },
    {
      "type": "substitute-for",
      "target": "oec:cable-woodchop"
    },
    {
      "type": "progression-of",
      "target": "oec:seated-thoracic-rotation"
    }
  ],
  "setup": {
    "position": "seated"
  },
  "status": "active",
  "summary": "A seated machine exercise targeting the obliques through guided trunk rotation against resistance."
}