So in some cases, this type of average won't make sense. Now, from a fitness perspective, let's look at moving cars. Suppose a car is traveling in this direction at 60. Suppose in this direction is a positive direction. Now suppose another car is also traveling 60 mph, but in the other direction, so it's negative 60, where 60 is our magnitude and direction is our negative sign. So if someone asks you what is the average of the first two cars, from a physics perspective you will say 60 mph.