for the record i was not suggesting a 'long leisurely ride' i was saying that you don't get a good workout on a fixed gear if you don't ride hard and long. and your original question of 'does it matter if it's there' is ridiculous. unless it's improperly tuned and rubbing on your wheel(which will only increase resistance and make you work harder) then of course it's not going to matter.

there's been so much discussion on brakeless / brakes i don't really see why this thread is worthwhile. but thanks for your PM anyway.