Project Amiga Juggler
meatfighter.com
meatfighter.com
But seriously, anyone who actually juggles could tell you that the person you rendered isn't doing it right. The balls should cross in an X pattern, not go around in a circle.
I can only juggle 3 balls, but I use pretty much the same technique as the animation. Throw balls from left to right in a small arch, and balls from right to left above that in a larger arch.
Though I learned how to juggle from a hippy leaflet I got from the Loompanics catalog, so perhaps I'm not doing it right.