While weight-bearing exercises require some degree of mobility, there is a passive, drug-free treatment which helps prevent bone loss even for infirm or wheelchair bound individuals. It consists of subjecting bone to mild Vibrations, which - just like vigorous exercise - helps actually increase bone density, and it is an effective treatment for normal and problem fractures as well. Increases of up to 30% in bone density were reported in sheep studies after one year by having them stand on a vibrating platform for a few minutes a day... Full Text