Various races are races of a very particular kind. Various races are called so because they are unclassifiable in other types of races.
Sometimes, that's the animals that make the race (for example, the tortoise and the hare). Sometimes, you do the race in sled. Well yes, the vehicle of Santa Claus has other uses that you didn't know!
You can also cumulate vehicles like in the Uphill Rush games in which you run with a dolphin, a motocycle or a quad...
Whatever happens, and no matter the type of race, you must end before the others.