Two balls are thrown with non-crossing throws like the throws in a 4 ball fountain (4s), one staying on each side of the pattern, and the other ball is thrown across from hand to hand (3s), about half the height of the non-crossing throws. The 2 is a pause between a 4 and a 3 with the same hand, where the other hand is just holding a ball and not throwing.
You can use these exercises to practice the same kinds of throws and sequences of throws that are done in this pattern, before you learn the full pattern.
Some of the siteswaps listed below are shortened to leave out parts where you’re not doing anything. Click on them to see animations of the exercises.
You should practice doing these starting with your right hand and with your left hand, so that you will be ready to learn the full symmetrical pattern.
Exercises to prepare for 423:
(4,2)(4x,2)* is a slightly different way of doing this pattern, where all the throws are the same height and the rhythm is even: right-right-left-left-right-right-left-left...