Just as easy as riding a bike...

[Diego in Seattle]

mvsidiot should try that bike...on the freeway (if they have those out in BFE).

[Wolfman]

Conditioning. Conditioned reflexes. Probably ingrained from when we first learned to walk. Don't have to "think" about how we do it. Good thing too. Otherwise our brain would be overloaded trying to process all the information we need. I'll pass on trying to ride that bike.