I work at a YMCA & I’m thinking about getting a specialization in one of these.
My personal training certification is with ACE and I have several specialty certifications with ACE as well. I have CES with NASM and with Justin Price’s The Biomechanics Method. I recommend that you go with NASM or TBMM rather than with ACE if you want to learn how to design a corrective exercise program for your clients. In my experience, ACE courses provide information that is just too general to prepare you to perform a proper movement assessment of your client. The NASM course gives you very specific training to help you understand which over active muscles cause your client’s knees to move in or out, cause an excessive forward lean, or an overly arched lower back. Then you learn which muscles must be strengthened to help the client to correct the muscles imbalances you find during the movement assessment. Both the NASM and TBMM courses have been a great boost to my career in fitness.