Do you sneak workouts in at work?
Poiesis: I bike to work.  I highly recommend it.  It takes me about 10 minutes longer in the morning, 5 in the afternoon.  The difference is a bit more with low traffic, less (or even favoring the bicycle) with high traffic.  For those 15 extra minutes daily, I get 2x25 minutes of high-intensity, low impact aerobic workout.  I don't pay for gas.  I have a dirt cheap car because I don't care about its gas mileage, etc.  I can focus much better after the morning workout.  I don't have to "sneak" anything. :)And: I can't get out of the afternoon workout.  Gotta get home!