GPP can start as early as you want and unlike some of the more intensive phases can be extended for quite a long period of time. I like to think of GPP as the base of the pyramid, if you don't build it up the foundation will crumble before you can reach your peak. Conversely, if you spend soooo much time on GPP that you can't devote adequate time to the other phases you'll likewise never reach your peak potential.
ELITETRACK Founder