With a full day at work it is often hard for people to find time to work out. Some people are able to work out before work, as the Google cyclists do on a regular basis. The group of Googlers, known as, "SF2G," bikes 42 miles to work. Click here to read more about the Google cyclists.
Brian from SellYourMac.com takes a different approach. I asked the question, "Why not workout while I work?" I found the answer to this question by purchasing a treadmill desk called the "Trek Desk" as seen here.