For those who are driven to increase their activity level for whatever reason, whether it be overall fitness, strength, endurance, weight loss, or to just get their bums off the couch, there's a presidential fitness challenge website now that has a program for adults.
For my generation, we had the presidential fitness challenge programs in elementary school. I got a kick out of them. You could see your progress, test your strength against others, work with others, and really see how you're doing and ways to improve.
And now there's a nifty site!
You can become part of a group, as well, and everyone do it together.