{
  "fitness": {
    "timestamp": "2013-03-10T07:12:16+00:00",
    "utc_offset": "-05:00",
    "type": "Running",
    "intensity": "medium",
    "start_time": "2013-03-09T02:12:16-05:00",
    "distance": 5149.9,
    "duration": 1959,
    "calories": 350,
    "activity_id": "12345",
    "extras": { "stars": 3 }
  },
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}