"It keeps me alive"

This morning, the temperature may have dipped into the upper 20s or lower 30s. I was pretty well covered in a basic commuter jacket, wintery (but still too thin for very cold weather) neoprene-like full-finger gloves, a full face (bank robber style) acrylic stocking cap, a Polartec acrylic fleece jersey, and wool (German Army surplus) knickers over Hincappie bib shorts. Note: I didn't wear (or even own?) a tall wool or wool blend sock, so about 6 inches of my lower legs were chilly...

While checking my bike in the midday today (I thought maybe I left my auxilary headlight turned on) a non-cycling coworker saw me and said something like "it's too cold to ride that today!"

My quick (but not necessarily well-thought-out) response: "It keeps me alive!"

I was expecting a reply back from her challenging or questioning how the bicycle keeps me alive, but there was none. It was an interesting but silent elevator ride back up to my floor. The whole time, of course, in my head, I'm trying to come up with a list of how bicycling keeps me alive.