How to do the juggles, man?

First things first; I can't juggle, so this task sounded extremely difficult. I found that the use of layers was especially helpful in this task to ensure that each ball landed in the hands at the desired timing. In the first attempt the ball wobbles midway through its cycle, which ruined its flowing arc of movement. However, when looping the animation the cycle works successfully.

In my second attempt I fixed the wobbling motion, although this also required all of the balls on each layer to be adjusted.