We test things for my sisters market research company, anyway, right now my 9 yr old Dd (and 4 of my nieces ages 5-9) is testing a MisFit fitness tracker. She LOVES it. There is an app to download, and you can compete with friends to see who has the most points each day. I like the sleep monitor too, knowing if she is getting a decent restful sleep has been interesting. My 12 yr old DD also got a misfit for Christmas. Hers is a lower priced model ($20 on sale), but still does the same stuff- you can find them at Target. It is a bracelet with a circular face like a watch, but has other accessories to wear it on a shoe or clip it to a strap (for ladies). She had 15000 steps yesterday (soccer practice)