Well, my best advice is keep moving. Even if you don't engage in a regular exercise routine, almost everything presents a way to stay fit. Take the stairs rather than an elevator. Don't look for the optimal parking space; rather park in the perimeter (and save your car from dings and dents too). Walk to lunch, the post office or any errand within walking distance if you have the time. If you're sitting at home, in an office or cubicle and aren't dressed up, do some pus-ups, sits ups or calisthenics at your desk. And forget about what anyone else thinks.