An actress holds a cauldron with the Olympic flame at the Temple of Hera during a dress rehearsal of the lighting ceremony of the Olympic flame in Olympia, Greece, the sanctuary where the Olympic Games were born in 776 BC
Judo - I love this for the fact that it really isn't offensive. Wrestling and Throwing, there's really not much more to it. No punches, no kicks, nothing. You learn to anticipate and utilize force and balance and even for someone as out of shape as me, it can still be a pretty effective way of discouraging the more violently inclined.