Good questions. Would also like to get this particular exercise information from the Bone Coach program. The PT / exercise part of his team is PT Sherri Betz , she presented at the 2nd Annual Symposium for Osteoporosis this past spring. As an OT (Occupational Therapist ) by training, I feel I can speak to the goodness of what she shared. Though I’ve been following and started my exercise following my L1 fix last summer finding out about Margaret Martin I still want to hear other GREAT PT’s perspectives , thoughts , and exercise ideas. It never hurts to get different input as long as it’s from a good source. I heard some things from her I hadn’t specifically heard from Margaret Martin. Let me know what you find out!!! Thanks!!!