An easy way to improve bone is to jump up and down 10-20 times on a hard surface every day (modify how hard you jump depending on what stage of osteoporosis you have. I read a study that they tried this on people with advanced osteoporosis and within a few months they had improved bone density. Obviously, be careful, and hold onto something when you do it so you don't fall. It's sort of a quick version of walking every day, as the pounding tells your body to add bone mass. Also, be sure to take all the right minerals and vitamin K regularly.