Exercise is more than using cardiovascular equipment or weights at the gym.  Walking is actually the most popular form of exercise in the U.S.  Depending on where you live and your schedule, you could walk in several short intervals to do your errands or to go to-and-from the car to your office, or walk at lunchtime with a pal, or don't walk at all if you don't like it.  Basketball, golf, bowling, dancing, gardening, and yoga are examples of exercise too.  The point is to think outside the box.  Get ideas about getting started with exercise from the Guide to Sports Medicine at About.com.