What is a true Hero??

So, one of my favorite movies is Disney's Hercules. During the whole movie, the main character is trying to become a true hero to get back to Olympus. He does all of these amazing feats, defeats many monsters, and becomes famous ,basically, over night. He goes to talk to his father, Zeus, and he tells him of all the things he's done and that he has an action figure even modled have him. But Zeus say that he's done great things but that doesn't make you a true hero, "he's just not there yet." Hercules doesn't understand that, I mean, he defeated everything that comes up against him, has adoring fan girls and everyone know him, why isn't he there yet? Well, it's because he hasn't learned that heroes need strong hearts and not just strong muscles. So, is that what makes a true hero? A strong heart, that's what makes a hero. Some one who is selfless and kind. They want to do good for other people they know and strangers. That what a true hero is, atleast to me.