Jack Black packs a punch as the voice of a panda named Po in Kung Fu Panda, in theaters June 6. Po dreams of being a martial-arts master. But his plump belly gets in the way. That's why everyone is shocked when he is chosen to train with his kung fu idols. Po is the only one who can stop the villain, Tai Lung. Black says bear-style fighting is "soft and bouncy." He adds, "If Po sits on you, it's pretty much over."