I absolutely am grateful that they exist. I had signed up for nasm pt & lost my son in a motorcycle accident so I had trouble getting back on track with my studies so Nasm granted me an extension and I thought i’d be able to pick up where I left off and I let my time run out b4 I got up the nerve to start studying again. Well once I did I realized that they switched the program to the newer edition of the book so I had to start all over from scratch using the online version of the book bc I didn’t have time to wait for the new book. FM audio lectures and study guide helped me to focus on what I needed to know to pass the exam plus the tools I’ll need to focus on when I started training. I was able to get through the entire book in 2 wks (which I don’t suggest-I spent around 8-10 hours a day studying, reading, taking notes, making flash cards etc. While simultaneously studying for my ACE GF cert) bc of my time crunch. Then I scheduled my test for ther following week. I’m proud to say that I took and passed my Nasm exam on the very first try. So with that being said it is worth every penny of my investment. He truly took away my stress and broke down concepts so that it wasn’t such a hard task getting through the book and learning what is needed. I’m truly grateful for all your help.