If you seriously think you will pursue a graduate program, then check with the graduate department in question and find who can advise you. Things are not always as one might think.
It is not unusual for graduate programs to have no requirement whatsoever that a person have the same undergraduate major.
It is also usual that there will be some list of courses that for admission purposes it will be very helpful for you to have taken, and which furthermore if you don't take as an undergraduate, you will have to consume time doing as a graduate student, the credits not contributing towards your graduate degree, whereas if you'd done them as an undergraduate they could have counted towards that degree.
Also check carefully what is required and what you will be doing in completing any undergraduate program that seems of possible interest.
For example, I chose microbiology as my undergraduate major because:
A) It was considered a desirable undergraduate degree for admission to medical school (which I then thought I would do
B) The required courses all sounded interesting and worthwhile
C) There were a ton of elective credits left over, something like 30 or more. Thus I had freedom to pick many other things that I found interesting and worthwhile.
In contrast, while I hadn't considered Exercise Science (though I did take courses in that as electives), that program had about three -- I am not kidding, three (3) -- credits left over for electives.
Lastly (or maybe I shouldn't put it last) a reality check on what the degree will do for income should be considered. This can be hard to really get a handle on. But for example will a Bachelor's in Exercise Science plus some outside respected training accreditation do better for you financially than a degree in some other thing and that same outside respected training accreditation?
I have absolutely no inside knowledge on it but I had thought that a Bachelor's degree in Exercise Science really didn't do much for employment in most cases. A Master's can result in some interesting and rewarding placements though.