If ever I were to lose motivation for bike commuting I'd consider the alternatives and motivation would be back in a snap! Honestly, I shudder at the thought of driving to a job (never owned a car, woohoo!) and sitting on the subway, while I love mass transit, seems like a huge waste of time that could otherwise be spent exercising via bike commuting. Call me logical but that's how I think of it. I used to do a bike - commuter train - bike commute. The time spent on the train would be used for getting work done on the laptop.