[hinkley]

I’m an ex cyclist but occasionally I like a bit of nostalgia. This recalls to me one conversation with a coworker who pointed out that while exerting yourself you can only absorb around 600 calories an hour, but as we know, you can burn thousands.

You have what’s in your muscles, liver, stomach, and whatever your body can cannibalize from fat and muscle. If you go long enough (without overdoing it) you start burning muscle, which is a really good example of why recovery and pace matter so much. And why runners and cyclists have those wiry little arms.