Yes you can be required to take a PT test while on profile. For it to be a valid test, you must perform one of the aerobic events: run, bike, swim, or walk. If you take an alternate aerobic event you must be given at least 90 days to practice that event. If you believe that this action is endangering your health I recommend you have a face to face meeting with your 1SG and CDR. You need to prepare for this meeting by putting together your facts and concerns. You must ensure that your discussion with the command team is professional and unemotional.