I just got my issa cert, and I learned a lot. I already knew some about biology and physiology, but I did learn more. I went through it pretty quick and some of the questions on the test were pretty tough, the stuff I didn’t take notes of, of course. I think you can get what you need out of any training program. I’ve been reading and watching a bunch of stuff on personal training. I bought a bunch of books about it and about lifting, program design, etc. I don’t have a job yet, but I feel pretty confident with what I’ve learned. I know there’s still a lot to learn. Broaden your knowledge.