Take a look at here for a large library of artistic representations of the combat sports from ancient Greece and Rome. Just about any technique that you might see in modern boxing, wrestling, Judo or MMA is represented.

The pig-on-a-rope punching bag under “Training Methods” is a particular favorite, but I doubt that I will be running out to the slaughter house any time soon.

As people debate naively on about which style or art is the best, these pieces are a nice reminder that there are only so many ways that one can punch, strike, kick, strangle or throw someone else.  No one art or culture  has any particular claim to any of them. Every culture has developed fighting methods, so a functional  similarity should be expected.