as of 2015 what is the recognized certification for personal training?
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It depends on what kind of education you’re interested in, or the kind of clientele you’re working with. If you’re working with a general population in a fitness club for instance, go for a neutral certification from NASM/ACE; if you’re working with a category of special population (rehab, etc) then look for specialized programs. I know ACE has some such offerings; if you’re interested more towards research, look into ACSM.