text: // FIT - Flexible and Interoperable Data Transfer
  // Strava strives to comply with the FIT Activity File (FIT_FILE_TYPE = 4) spec as defined in the official FIT SDK.
  //
  //     Many, many, attributes are defined by FIT. Below is an overview of those used by Strava.
  //
  //     MESSAGE TYPES	ATTRIBUTES
  // file_id	manufacturer
  // product
  // time_created
  // session	sport
  // total_elapsed_time
  // total_timer_time
  // total_distance
  // total_ascent
  // lap	timestamp
  // total_elapsed_time
  // total_timer_time
  // total_distance
  // total_ascent
  // record	timestamp
  // position_lat
  // position_long
  // altitude
  // heart_rate
  // cadence
  // distance
  // power
  // temperature
  // event	timestamp
  // type
  //
  // Activity type is detected from session.sport.