Each child has a "bubble" and we do not like our bubble invaded! Everyone starts out and runs towards each other, the idea being that you get close enough to someone to bounce off of their bubble, but not touch them. If person A accidently touches person B then person B has to run around and tag everyone, popping all of their bubbles. Once they have been tagged they have to stay in place and do any form of exercise they wish. Once all players bubbles have been popped (tagged) then everyone regains their bubble and they attempt to bounce off of each other without touching each other.
I have played this game in only small numbers, less then ten children and the kids range from 2nd - 6th grade.