def zones(self):
        """
        :class:`list` of :class:`stravalib.model.ActivityZone` objects for this activity.
        """
        if self._zones is None:
            self.assert_bind_client()
            self._zones = self.bind_client.get_activity_zones(self.id)
        return self._zones
def zones ( self ) : if self . _zones is None : self . assert_bind_client ( ) self . _zones = self . bind_client . get_activity_zones ( self . id ) return self . _zones
:class:`list` of :class:`stravalib.model.ActivityZone` objects for this activity.