For some reason, I often find myself doing math problems in my head while I ride, like:

- How many pedal strokes will I take on this ride?
- That water stop just took 4-1/2 minutes...how fast to I need to ride to make that time up?
- If I need to be home at 3, and I am riding into this headwind at x mph, how far can I go and still make it home in time?
- How much further will the outer end of one of my spokes travel on this ride than the inner end?

I don't recommend thinking about these things on purpose...it's just where my mind goes.