Juggling, diabolo, poi, unicycles, fire and more - Bath's very own circus skills society! We do all kinds of juggling magics
Here are a few 4 ball lessons...
Juggling Stein Tutorial - 4 Balls:
The concept of juggling 4 balls is very simple. You juggle 2 balls with one hand... with both hands! I disagree with this person when he says that 'syncronous' is harder. I believe it is easier to learn 'syncronous' but you'll probably find yourself juggling 'asyncronous' a lot more when you learn how to.