X-Doria KidFit Activity/Sleep Tracker for Kids KidFit is the fun way to get kids moving and building healthy habits for life! KidFit is a wireless activity and sleep tracker for ages 5-13 that encourages and motivates kids to play hard and get enough rest. The KidFit wristband is a one-size-fits-all slap bracelet and is IPX3 (Splash Proof) rated. A daily activity target is customized for each child and scored out of an easy to understand 100 points. With each sync, the KidFit app motivates and encourages your child to reach their activity and sleep goals. Built in goals keep kids challenged and parents can set custom goals tied to real world rewards. The free KidFit app is available for iOS and Android.