Ball Strike is a game where balls pop up in the screen at random places. Task is the move arms and legs to pop the balls and by doing so score points. The game shows the level you are at, how many points you scored, how many balls you missed and how many calories you have burned! The lite version gives you 4 levels and the paid version is cheap and goes at least past level 10 (have not gone further yet!)
Having my 10 Kindergarten kids walk in the dance studio with 10 ipads set up with ground markers in the front was amazing "Coool, iPads in PE!"
I explained to them only to press start on the iPad and then play the game, follow the instruction while standing on their on ground marker. Not much else was needed and soon they were all working, independently and at their own level and pace.
Grade 1 used it as a warm-up for a dance unit and besides the fact that they loved it and were all busy and active, it also helped to get the students to become fully open-minded about moving and we spoke about rhythm, beat and creativity!
If you have 1:2 devices you can do it, if you have less, you can set up a station and let kids rotate to give them all a turn.
For me, I will get my kids out on stage at assembly next to show the whole LS what PE can also look like!
Let me know if you decide to offer it in your school!