One thing I wanted to mention as well is if you meet with a fitness professional and they do not ask you if you have at least met with a doctor dont just turn away, run the other way.
This does not mean that you have to meet with a doctor but a fitness professional should at least ask if you have met with a doctor or encourage you to do so if you are just beginning and exercise program.
All qualified fitness professionals are taught to only be trainers and not practice outside their scope so it is incredibly important for a fitness professional for their potential client to have met with a doctor to know they are cleared for activity or what limitations may exist. Same holds true for someone who is currently injured or coming off an injury, the fitness professional should request information from the doctor or therapist so they can properly guide you through exercise.
Be very leary of a fitness professional if they at least do not ask if you have seen a physician before meeting with them.