There are a multitude of useful applications available for use on both Apple and Android App stores. Depending on your available budget, the number of devices available to your class, and other forms of technology available to you (Laptops, Projectors, etc.), different applications may suit you better. Below are some applications I found useful during my practicum, including those I used during my Inquiry research. I have also attached the lesson plans I designed to help incorporate these technologies into the Physical education classroom.
https://www.youtube.com/watch?v=-jRVzBjc7zg
https://www.youtube.com/watch?v=pFFv6_6was4