It's a great idea for anyone of any age to start making sure they are moving enough in a single day. A good way to do that is to track the actual steps you take in a day with a pedometer. The current recommended amounts are: 10,000 steps for active adults, 6-12 year old girls need 12,000 steps and 6-12 year old boys need 15,000 steps.
Kellogg's Frosted Flakes has gotten on board to this idea and is now encouraging kids to start being more mentally active in their own health, by getting them to be more physically active in their own lives. A free (my favorite word) step counter featuring Tony the Tiger inside specially-marked packages of Frosted Flakes cereal allows kids to track their daily steps. Your child can attach it to a belt or waistband and count every single step they take. Like most free pedometers, it may not be 100% accurate, but it is a fun way to get kids to think about health issues early on.
Don't have kids? Use it for yourself! Not into having Tony the Tiger on your fitness gadgets? Then maybe it's time to splurge on your own adult pedometer (that really works).