You really don't need to have a set major for the first year or two at most four year colleges as you will be required to finish your undergraduate classes. This is the time that many people choose what they want to do based off the classes that interest them the most and what they find the are good at.

If you are serious about going into the health and fitness industry than you are probally looking at degree in physical education, sports medicine, or fitness management (or a related field, such as anatomy or kinesiology). Based off the major that you choose then you will have a bunch of assigned classes and can always add in the electives that interest you the most.