If you are wanting a certification there are many online programs that allow self study. If you are wanting a college degree I know that Minot State University, University of Mary in Bismarck, and NDSU all offer Exercise Science programs. Lake Region State College in Devil’s Lake is now offering a 2 year Fitness Trainer Technician degree as well. It is harder to find local workshops. I know that AFAA and NETA come to ND occasionally.
What I would highly recommend is if you are looking to work within a certain city or a specific club – call and ask what they recommend/require. Some clubs in the state will allow you to apprentice while studying for your certification. I am in Bismarck and know that my clubs (Snap Fitness) only want an accreditted (NCCA) certification. While another club in the same town requires NASM. If you are looking to work for yourself really just look into as many NCCA accreditted progarms as possible and find the one who’s price, CEC process, testing process and philosophy you agree with most.
Hope this helps a little. Any more questions let me know I will gladly help!