dude, its up to genetics how tall you are. Doing that spine stretching crap works but its not permanent. Most you will gain out of a year is like 1 inch, if that. Theres nothing you can do, well acually if you take human growth hormones, it can help you grow but that costs a lot of money and doctors wont give it to you unless you are very very short and are in need of it, or have problems with your bones and what not.