Strange but amazing art forms

Sarah and I were taking it easy this afternoon and we were watching some music videos to pass the time. We got to watching some videos by Fatboy Slim and Dirty Vegas, but there was one by Fatboy Slim that I thought was just amazing. I was just wondering how long it must have taken for the people in the video to master the art of juggling so well that they're able to perform such feats of coordination. The number of hours must be boggling.

Juggling Video