http://articles.mercola.com/sites/articles/archive/2008/01/02/run-for-stronger-bones.aspxWhen it comes to exercise, brisk walking and riding a stationary bike are the least likely to strengthen bone. If people really want to bulk up their bones, they should try running instead, according to a report presented at the 66th annual meeting ofenCommunityServer 2008.5 SP1 (Build: 31106.3070)