Originally Posted by max-a-mill
i agree, at first, but that fatigue is you getting stronger buddy.
i really think my mountainbiking went up by leaps and bounds when i started commuting almost exclusively fixed... and now that i haven't for months i am back to my usual schlubb self fitness wise.

No doubt about it....my riding in general went up by leaps and bounds as a result of riding that thing. But it may have more to do with the limited gearing than being fixed.?