The legend of the Kung Fu panda starts in a small shop down in china. Where our hero works with his data and makes and sells noodles. One day, he discovers that the ultimate master of Kung Fu in his town is looking for a Dragon warrior (whatever that means). He comes up with an elaborate plan to apply and join. He gets lucky and chooses to become the dragon master.
Right around this time the real or ex-dragon master escapes prison and is coming to take the spot and obtain a scroll that is going to make him give uncontested powers eternally. He starts to train, train and train. His master has to come up with unconventional ways of teaching him because he is a Panda, and there has never been another panda kung fu master in the history of the town. Train they will, with sticks and stooges and even with dumplings too. He trains with the other 5 fighters that he admires.
Before he is ready, that even guy who wants the scroll of power pays a visit. He now has to fight him to death or at least to keep the scroll from reaching his hands because he is to gain eternal power because of this. The fight goes on for a little while until he remembers that the secret to doing a kind attack that can break even the strongest of the opponents, is actually not a secret. It is but a fable, made up thing to make others think the one who can do it is somewhat of a master.
So, realizing that there is no secret to what he thought was secret, he uses the move and wins the fight. He then becomes the true Dragon fighter and liberates the town from that evil guy.