A degree in business is excellent
If you can get another degree in Health Science , Kinesiology or Exercise Physiology that would be wonderful
As for certifications, I recommend Nationally Recognized Accredited ones such as ACSM, NASM, and ACE
There are many questions on this site about this very topic
congratulations! What a wonderful plan for the future. I started my career in the fitness industry when I was 40 and had wonderful 18 years so far.
Susan’s suggestions are right on. Whatever your plans may be, you may also need to get a certification regardless of whether you have a degree in exercise science or not. Personally, I have an affiliation with a wellness center, and there such certification is required even in the presence of a degree. The stated reason is that certifying organizations mandate continued education and current CPR/AED whereas a degree does not.
I wish you good luck for the future.
In addition to what Susan and Karin suggested, you should try to attend as many workshops and seminars as you can. There is a lot of new information that comes out continuously, so you must take advantage of it. Usually whatever certification(s) you decide to add to your credentials, they offer many great workshops, seminars and conferences with a lot of information about fitness and nutrition. Most certifications will actually require for you to sign up for a number of such events as part of their continuing education requirements.
Good luck with your search!