Tricia,
Thought you would find this article interesting while waiting for an answer:
HEALTH | November 11, 2009
Well: Phys Ed: The Best Exercises for Healthy Bones
By GRETCHEN REYNOLDS
Researchers readily admit that they don't fully understand why some exercise is good for bones and some just isn't.
http://well.blogs.nytimes.com/2009/1...ones/?emc=eta1