I have asked Ben Pakulski about the best and most usefuls certifications out there and he has recommended RTS123:
resistancetrainingspecialist.com/rts123.html (I can't post the whole link yet)
Has anyone here done it? I live in Europe and I'd have to do the online version so I wonder if it's really worth it, I have a degree in Sport and exercise science but I'm always trying to learn more.
Thread: Ben Pakulski recommendation