There are different ways of catching a yo-yo, and one of those ways is the Backside Catch. It's when you throw the yo-yo out and just catch it, like that, behind your back. And what you do here is you're tossing the yo-yo out and when you do that you take the string back here and just grab it with your hand and use this to kind of aim, pull it tight until the string gets close to the yo-yo, and then you can let it loose and then just catch it on the string. It's pretty much like one of these throws but just like that, so you're just bringing the string back to your hand behind your back and then catching it. And that's the Backside Catch