Dame Vivienne Westwood rides a bicycle (and look at those heels). That should be enough to convince anybody to get on a bike.
Photos from contactmusic.com- as you can see...
Added to that she sends her models down the catwalk on bikes- in six inch platforms.
I don't recommend trying this at home...
It might not be the most practical, but if we all practice, everyday, I'm sure we'll be looking as ridiculously good in no time...