code: def ascent(self):
          
          total_ascent = 0.0
          altitude_data = self.altitude_points()
          for i in range(len(altitude_data) - 1):
              diff = altitude_data[i+1] - altitude_data[i]
              if diff > 0.0:
                  total_ascent += diff
          return total_ascent
docs: Returns ascent of workout in meters