If I commit myself to lifetime of good habits, could I potentially maintain an upright posture despite almost certain fusion? For example, if I am taking my medication, exercising and ensuring that I maintain good posture at all times, to what degree would this generally help?

I'm just wondering how AS affects your spine and posture over time? Are the degenerative effects and physical deformities independent of all of these therapies? In other words, if I were to exercise every single day and do absolutely everything 'right' in order to manage this disease (according to conventional wisdom), how much of an impact would that play in preventing bad deformities?

I have instilled a very strict, disciplined rigid posture when I am sitting down and standing up almost to the point where it is natural for me to sit as upright as possible and walk with my head up. Will it become harder for me to maintain this over time or is this going to help me in the future?

Thanks in advance for any answers. I have always found fusion and posture a really ambiguous question and if there is any advice out there that would be great!