Name Of Trick

In most of the competition videos that I've seen on YouTube most do a trick where they bounce the yo yo up in the air off the string that is between their hands. What is the name of this trick and is it very difficult to learn? I assume that it can be done with an unresponsive yo yo.

Eli Hops. Not that difficult, but takes practice. But it’s worth it!

It’s called Eli hops.

It can be found and learned here:

Dang it.

Ninja’d.

That’s it, thanks.