Think of lifestyle exercise as stealth exercise: doing what you’re doing now, only being more active at it. Follow the “five and 10” rule for escalators and elevators: Take the stairs if you only need to go up five floors or less, or down 10 floors or less. Walk to errands less than a mile away whenever possible. While watching TV, do situps, leg lifts or lift light weights during commercials.

I try to walk to my coworkers' offices rather than emailing them if I just need to ask a quick question. I also started using a smaller water glass at work so I have to go to the water cooler more often.