Hi, Smiley2! I got certified thru ACE as a group fitness instructor back in Feb. 1997 and I must say that, even if I had not gotten certified to get hired as an instructor, I still would have valued the study materials and process for my own knowledge. I still have the textbooks for the group fitness instructor manual AND the personal trainer manual, and I find myself referring back to the chapters on anatomy, exercise physiology, biomechanics and applied kinesiology, nutrition, health concerns and special populations etc., on a regular basis. The more I instruct and the more I work out in ever more various modes, the more sense it all makes to me!
Just my plug to go ahead and get the core texts for your own use!
a-jock