code: def get_splits(self, id_num, unit='mi'):
          
          url = self._build_url('my', 'activities', id_num, 'splits', unit)
  
          return self._json(url)
docs: Return the splits of the activity with the given id.
  
          :param unit: The unit to use for splits. May be one of
                        'mi' or 'km'.