Encourage your kids to get active and keep control of screen time with the PlayGoal Smart Activity Tracker for Kids. This clever device locks Android and Kindle devices until your child has hit certain fitness goals. As a result, your little ones have the incentive to run around more. You have total control over the goal and rewards you set, with loads of activities to choose from. For instance, you could ask for 1,000 steps, 50 jumping jacks, or just a game of tag in the park. Whatever you choose, PlayGoal will keep count of all the exercise. Once the goal is reached, their device unlocks for the time specified by the parent. Along with tracking calories burned and steps taken, PlayGoal can gently remind your kids when they stay seated for too long. The small OLED touchscreen is easy for little fingers to use, while the whole device can survive rough and tumble.