For a couple months I have been using inversion table and stretching, mainly back and neck, I've definitely got more limber and back actually feels better. I've gotten to the point where I can just start getting tip of tongue to head of my dick when flaccid. Would like to get head of my dick in my mouth so I can feel myself shooting cum into my mouth. I'm in mid 50s so not as limber as I used to be, but not in bad shape. Any suggestions on ways to become more flexible to obtain my goal?