[Hayarotle]

And furthermore, the two skills depend on each other. If you can't keep your balance, keeping your feet in the pedals means falling down and not getting back up right away (as you also have to learn how to quickly get your feet off the pedals and onto the ground). If you can't pedal, you can't get a fast enough speed to make it easier to keep your balance. Combine that with the fear people might have of pedaling at a higher speed and falling, it's understandable why some people never learn how to ride a bike