[mathteacher1729]

No link offhand but I recommend mastering 2-in-one-hand juggling (zero in the other) three different ways: columns, clockwise, and anti-clockwise. Learn to do each of those patterns such that you forget which hand was ever dominant to begin with and then you're ready to try 4 throws and catches of 4 balls.

Another good exercise is to juggle 3 balls in the usual fashion (cascade) and make a decision to go directly into juggling 2-in-one-hand and hold the other ball steady. Then resume your cascade and try it again, but this time, use the other hand to juggle 2.

These exercises are fun and give you a sense of accomplishment in and of themselves, but they also really help lay the groundwork for a solid four ball pattern.

When finally learning to juggle 4, some people prefer a synchronous columns(1) pattern or an asynchronous fountain(2) pattern. For the best results, try each until you forget which one you ever had a preference for in the first place.

(1) http://libraryofjuggling.com/Tricks/4balltricks/FourBallColu...

(2) http://libraryofjuggling.com/Tricks/4balltricks/Fountain.htm...