Adults in the United States are just not getting enough physical activity, period. We are getting bigger and bigger - here's 5 tips that could help.

• Don't use elevators or escalators; instead, take the stairs. Start with one such substitution a day, and build up slowly. So you work on the 50th floor? Ride up to 48 and walk up from there. Careful, though -- walking down stairs can be hard on your knees. Walk up, but ride down.
• Stop circling parking lots and fighting for the closest spot. Park a little bit farther away from the office or mall, and walk. You'll not only increase fitness, you'll decrease stress.
• If you take the bus or subway, get off one or two stops early and walk the rest of the way.
• Vacuum more often, change the sheets more often, mop the floor more often. These get your heart pumping, which means they are excellent calorie burners.
• It's summertime! Get outside! Cut your grass, weedeat or spray around your house for bugs.