It will be comendable to find two slopes with differen inclination; Long slope (8% aprox ), Short slope (25% aprox ).1st serie; 8 iterations of 50 meters over 8% slope. 2nd serie;6 iterations of 50 meters over 8% slope but faster..3rd serie; 4 iterations of 10 meters over 25% slope.Slope, inclinated upwards..