favorite self defense move, no weapons

[MikeA]

Punch to the nose or chest get a good one and down they go.

If you can, I recommend Krav Maga over all others, its devised to be quick to learn and brutally effective, less DoJos, Mats, Gias and monotomous air puching, and more hard floors, sparring against 3 at once, and the use of a rolled up newspaper.