While watching TV, have a contest for who can come up with the most fun exercise during commercial breaks, like jump roping with an invisible rope.
Bring a football, soccer ball or basketball on vacation. Get outside with the kids and join the fun, or invite a bunch of kids over to join in.
What teen turns down a chance to go hang at the mall? Even if they aren't doing power laps around the storefront perimeter, they will at least be off the couch and moving. While they cruise the mall for their friends, you can walk, window shop and burn some extra energy, too.
The holiday break is the perfect time to do something fun as a family. Instead of sitting down to a board game (which your kids don't really like, anyway), visit indoor jump houses or trampoline facilities, rock climbing centers and playgrounds that have open play for kids.
Instead of piling in the car to drive around the neighborhood, bundle up and walk to see the holiday lights.
Depending on the age of your children, you can develop a hunt that will get the kids moving around the house. Try a "Safari Hide-and-Seek" for the little ones using toy animals, or a "Money Scavenger Hunt" for the older kids, using Monopoly money. Just finding the most animals will delight the younger kids, and to give motivation to the teens, whoever wins gets time off from dish-cleaning or trash duty.
Even if your teen would rather thumb her way through a game on her phone, she probably doesn't want Mom to beat her doing a physical activity. See who can do the most sit-ups, push-ups, jumping jacks or any other activity that will get your kid's heart's pumping.
Purchase at least one present for the kids that will get them up and moving. A skipping rope, Wii game or even a hacky sack will encourage more movement.
Families who exercise together, stay healthy together. Many towns have holiday fun runs for charity. Rally your family to train and race together for the big event. Then pick another race every month or so to keep everyone motivated to stay in racing shape.
Whether it's a yearly ski trip, a hike through the woods to cut a Christmas tree or a visit to the outdoor skating rink, replace sedentary holiday traditions with more active ones. Then make sure you encourage active outings all year round.