Hi Amy, Excellent question re: Low Bone Density...something that after filming ended I thought "dang, I needed to be more explicit". Between chemo and the followup adjuvant therapies (endocrine therapies specifically), bone health is important. This is also why standing exercises, similar to the ones in this video, are important. If you are concerned about bone density, follow appropriate Osteoporosis protocols. Any other questions, feel free to post. Thanks again Amy