Some of the stories I've heard about Chi makes it sound like, if I developed my Chi enough I could be Superman or Luke Skywalker. That might sound silly not to mention an exaggeration, but I've heard of people performing tremendous feats of strength, speed, ect. using Chi. I also heard it can be a fountain of youth, the way Yoda was able to bounce around like a muppet on crack when he was over 800 years old which even for his species is quite old.