If you have Rick Lax trick "Past, Present, and Future", then you absolutely need this. There is no
reason why you shouldn't be performing both of these togehter. Hell if you are using the "past,
present, and future" premise in any of your routines this should be performed right along with them.
This is absolutely a fantastic trick and I will be performing it from now on. It does
require some memory work but I used flashcards and memorized it in about a week (just to make sure
that it was solid).