Usually, exercise goes from the practical to the gym: Bike to stationary bike, for example. The bike above has come at it backwards. It is an elliptical bicycle, based on--I assume--the elliptical machine you'll see at most gyms.
Doesn't strike me as especially practical, but neither do scooters or skateboards. In any case, these two lovely people are getting a nice does of exercise at River's Edge Park in Roanoke.