Impact therapy
I'm a 68 year old male and I have no idea of the quality nor density of my bones, but I practice aikido several hours a week where we throw each other around and land on 2+" thick foam mats. I've experienced no diminishment of my ability to move or the strength and agility of my muscles and joints over the last 15 years of doing aikido. My laymen's theory is that after being repeatedly thrown 10' through the air and landing (always safely) that the jarring or impact keeps my bones stronger because of the use it or loose it part of body maintenance. Jogging also jars the bones, but because it is so repetitive and in the same direction and is done on such hard surfaces, I think the joints suffer more over the years than the more random jarring of landing on a mat. I'm a physicist by training, so don't know the physiology and medical effect of my sport, but have a good feeling about it. I'm also vegan and know animal products in the diet diminish blood flow to all parts of the body which may effect bone health.
