If you work from home a lot or stick in the office for hours, try to walk home if it is a walking distance. Walk to the supermarket rather take the car. You could be working on your fitness and saving on gas at the same time. Stretching a little for a couple of times while working on your desk all day in the office will keep your heart busy, even if it is for a couple of minutes. Make a deliberate attempt to visit the park daily for a couple of minutes and the walking will do you good. No cost involved.