You could get a
Bachelor's degree in that field, you could get NASM certified, then there's
CSCS and NSCA ...
Does that give you a place to start?
I think for the Bachelor's degree you need at least 3 or 4 math credits. That's not that much math at all. It really all depends on where you get the degree from too though. For example, GCU requires 3 math credits and NAU requires 4. So yes, you will need to take math if you haven't already, and you will probably need at least "College Algebra" level.