In my youth, I walked to school where I mostly sat, and walked home, where I mostly sat. I never practiced sports or other physically strenuous activity, except some weight training as a teenager, and I never stretched. And that's true of my entire life thus far.
My question is: what evidence is there that I can or cannot increase my flexibility beyond a certain threshold determined by my past sedentariness, assuming "unlimited" flexibility training from now on?
Obviously, this is not a question about motivating myself by telling myself optimistic white lies about science, so please do not answer in that way. I just want to know what evidence there is for and against my past body treatment affecting my future body potential, given a lot of training