I also have the CES through NASM. I found it to be an excellent course. You can use the text book, online text book, and online videos. The videos demonstrate how to perform an assessment and clearly teach you what to look for. Weight loss and performance enhancement is not part of this course. There are separate NASM courses which focus on those topics. Having the NASM CES has helped me expand my base of clients. I am sure the Justin Price course is also very good, but as I remember it is quite expensive. I think it was over $2000 and I paid less than $600 for the NASM CES.