A bike commute leaves me more refreshed than a run in the park, a round of video games, or reading a book. David Byrne wrote about this in Bicycle Diaries:
It (biking) facilitates a state of mind that allows some but not much of the unconscious to bubble up. As someone who believes that much of the source of his work and creativity is to be gleaned from those bubbles, it’s a reliable place to find that connection.
There are lots of things I’m looking for when I’m riding a bike: cars turning right, traffic lights, pot holes, babies in strollers, tourists on Segways, etc. On the surface, these look like annoyances, but they are a secret gift: for my own safety, I’m forced to live in the moment. It’s a needed escape from a day spent coding and planning.