Have you heard of gesture recognition? It is the ability for the iPad camera to interact with your actions. There are a few, fun gesture recognition apps but I will start with my favorite one for today - Ball Strike.
Free for lite version $0.99 for full version https://itunes.apple.com/us/app/ballstrike/id541879968
This app is super fun. Using the front facing camera on the iPad it is a gesture recognition app using augmented reality fitness activities. You have to simply touch, kick or spin to burst the balls. Get kids moving and kicking at various targets.
The free version is most likely suitable for most young children. This app is well worth a try. Here is a video of the app in action.