Exercise doesn't just mean jogging or swimming or staying in the gym. Pick activities that you enjoy. Activities such as bowling, golf, dancing, gardening, in-line skating, rowing, racquetball, swimming, tennis, volleyball and hiking all count as exercise -- just to name a few. Keep things interesting by changing up your routine occasionally or trying a different activity.
You can use the activity as an opportunity to try something new, or to meet new people. It can also be a chance to spend time with friends or family members. Why not take a hike together instead of going to lunch (or even after your lunch)?
And take a tip from kindergarten teachers and their gold stars -- chart your progress each week, and as you achieve each step, reward yourself with a treat.