Make no mistake—Bruce Lee is the greatest martial artist of all-time.

Born in San Francisco, Lee soon moved to Hong Kong with his parents and studied Wing Chun with one of the most legendary grandmasters (see No. 5) to ever live. But he didn't stop with Wing Chun; he evolved his passion for martial arts into other disciplines, becoming the "father of mixed-martial arts," as UFC President Dana White put it. He sharpened his body and mind on everything; he trained, read, and worked out constantly, honing his craft for audiences around the world to see.

You may have seen his movies, but how much do you really know about the greatest martial artist to ever grace the earth?