From the Gym PE Creations: Physical Education Math Scavenger Hunt Station activity. Full instructions and station signs included. Could modify it to any aspect you are teaching, and incorporate math. Jogging, jumping jacks, dribbles, etc.
PP said, "musical chairs reading. Play music and when the music stops students stop, sit down and start reading! Lots of fun and something different to develop reading interests." Perhaps you could also put letters of alphabet on chairs &/or sight words.