Bruce Lee is still considered one of the undisputed masters of martial arts, and countless fighters, athletes and other physical folks have been inspired to take it to the limit by the mighty Bruce.
His biggest strengths were his incredible speed and knowledge of striking, which made Bruce more than a match for fighters twice his size, but you really have to see his speed to believe it.
Bruce demonstrated his superhuman striking speed on a somewhat willing target in this excerpt from the 2012 documentary I Am Bruce Lee, don't blink or you'll miss the moves!
-Via GeekTyrant