i did a triathlon after riding my fixed solid for a couple of months last year right when i got it, to say the least, i was pretty much pedaling the whole 15 mile segment which was nice. but riding a freewheel is scary.

i have WAY more control on my fixie gear with just my legs rather than depending on brakes etc... to control my speed. everyone i explain my bike to thinks it is a bit absurd. then they try it. and then they want to ride it everytime i am over.