A bike isn't flexible in that I can't work while using it, I can't use it whilst intoxicated, I have to find somewhere to secure it. I have to be fit to use it.

A bike isn't flexible in that I can't work while using it, I can't use it whilst intoxicated, I have to find somewhere to secure it. I have to be fit to use it. I can't use it when I'm sick or too told.