How Your Bones Change With Exercise

Forces acting on our bones during everyday movements and exercise have a strong influence on the size, shape, and strength of our bones. If we move less this can make our bones weak and more likely to break, but being active and doing exercise such as running, football, or tennis can help make our bones much stronger. At the moment, exercise trials seem most effective in children and in stopping or slowing bone loss in disuse.
https://www.sciencealert.com/here-s-what-exercise-does-to-your-bones