Tag with running and balance!
We used foam mats inside, but you could use a line of rugs or play clothes on the ground to make the track.
Make a long winding path just wide enough to run on.
The rules of tag where you chase each other, but on the path. If you leave the path then you are it!
You can backtrack to go by the other person, but only by saying, 'Balance Beam!' and walking toe to heel with arms outstretched like a real beam.