Make a standing date for a walk around your neighborhood every night after you eat dinner -- even if you only have time to walk for 30 minutes. Walk for as long as you can, but just make sure you go! Enjoy the outdoors and the fresh air with your spouse, and use this time as a way to catch up and discuss the day's events and happenings.
If you get serious about power walking, invest in a pedometer and aim to walk 10,000 steps each day. Get in those steps by taking the stairs, parking your car farther away from your office and lapping the perimeter of the grocery store before you begin shopping.