At the end of last year I changed projects at work, which allowed me to start commuting to my company’s downtown office instead of a client site. Since I live about a mile away from the office I started walking to work each morning. At first it was a little tough. The distance itself is doable. But the 25 minute walk isn’t any shorter than my previous commute, so during those early days I longed to hop in my car, crank up the A/C or heater, and be there in 10 minutes. The walk itself is genera...