Check out The Bone Clinic. They talk about exercise in particular deadlift,back squat and overhead press plus hanging and dropping from a bar. An exercise physiologist work you up to this with instruction and progressive overload. Check out this Youtube with National Spine Health Foundation and The Bone Clinic. I had osteopenia and now have normal bone density. I did this with a similar workout to the above. I did it on my own. I am an experienced gym goer so knew technique etc.Bottom line you can build bone with exercise. Supervision is recommended for most.