How sick humankind is...
I haven't given a number because I have no idea how to base an estimation. I have never fought 5 year-olds (play wrestling or otherwise), so I don't know how much punch they have.
You would think that if there's a decent number, you could just flail your arms around to knock out some of them at the start. I'd stay away from running. MUCH too easy to be tripped like that.
Once you do some flailing and knock some out, then the technique of using one as a weapon could be used...