What is that Burn?

Oh, that is the burn you feel in your thighs when you've been routinely falling prey to the temptation of gears, but then you do a hilly ride on your fixed gear. Its one of the few aches and pains which still puts a smile on my face. Here in Frederick County, the mountains are all in the west. But it is the east side of the Monocacy River valley that can get you, because there are plenty of short steep climbs which hardly even appear on the radar until you are trying to figure out why you feel so bad halfway up one. And on the fixie, you don't even get to rest on the way down. Hurts so good!