i ride a fixed gear for the exercise and because its better than no gears. gears have always really annoyed me, i hate the clicking sound of the chain throwing itself across the sprocket to get in gear. not to mention the time it takes to actually do it, its about 5 seconds of click click click click *now in gear* finally i can go up the hill or whatever. instead with a fixie im already half way up the hill nice and quick. simples