If you're in your teens, the of women, that's really the time to start doing some weight bearing exercise can start off body with exercise, running, and as you get into your later teens, start incorporating heavier weights, and that's very important, because after 30 years the bone mineral density you have starts to trickle away, for men as well, but especially for women because of the predisposition to
developing osteoporosis due to a loss of oestrogen with advancing age.