What's it called when you are on the ground on your back and you kick up with your feet and land on your feet?

I've seen it in a lot of kung fu movies, where they get knocked down and then they just roll back a little and then kick up with their feet, get completely air born, your body rotates forward a little allowing you to land on your feet. I'm curious, what is this called?|||It's called a Kip-Up.|||Kick up.|||a kip-up|||a jump :P i dont know but i hope i helped you anyway