Opportunity costs

This morning, instead of riding my bicycle to work, I opted to take the Metro. Given that I'm an unabashed bicycle lunatic, this is odd; given that it was a beautiful, sunny morning, this is downright disturbing. Why would I give up a great riding opportunity to sit in a crowded train in some dank tunnel? Well, first off, most of the metro ride to Silver Spring is outside, so it's not in a tunnel. Secondly, riding the Metro does give me opportunity to read. Thus, I basically traded my bike ride for the chance to read and notate Erik Loomis' blog post. Apparently, I'm reaching the age (or laziness level) where intellectual exercise can be more enticing than physical exercise. Look out potbelly, here I come!