Amazing Basketball trick shots!

My brother just showed me an amazing video of some guys who's doing these basketball tricks. I really get the feeling that I'm just a kid when I watch them .. they're amazing!

And the amazing part is, that this video was filmed during a practise when they were just playing with the ball doing basic tricks. In other words, this are just "basics" to them. Imagine what they could do while being serious?

How many years of practise do you think is behind this?