Honestly, the only reason the skateboard is even slightly useful is because of its speed being able to take you from point A to point B faster than on foot. However recently i wonder if sprinting is actually faster than using the skateboard, the skateboard does seem to have realistic functionality though, for example, when you skateboard down from a huge hill or road bump, you gain more momentum and thus travel at higher speeds.
So enough with the blabbering, lets say there's two jimmy's, one is sprinting, one is skateboarding, the road is clear and its a 1km race(won't be a problem for jimmy's infinite sprint), which would win?