Most of us are guilty of circling around the parking lot, trying to find the closes parking space to the door of the store or the office. By parking further away, you may save time and gas. You also get a few minutes of extra exercise in to your day. Instead of waiting for the elevator you can walk of a few stairs and get some exercise. If you are in a high story building, walk up the stairs half way, and then take the elevator.
Stairs are a good cardiovascular exercise.
If you work near an area that has a restaurant, walk to lunch. Walk on your lunch break. If you bring you lunch to work, eat, and then walk outside for a few minutes or around your office. During your breaks at work or whenever you have extra time on your hand, do some stretching exercises. You can also do this when you wake up.