The main thing that seems to have come out of the research through this particular program is that in order to actually reverse the osteoporosis lifting must be done consistently and progressively. The idea is to keep challenging the bone to grow stronger. Lifting heavy weights MUST be done correctly to avoid injury. At a recent seminar that I attended at The Bone Clinic they stressed that training is very important to learn the correct technique. In the thousands of classes they have run now,they have only had one injury. They teach you how to know when you are ready to increase the weight. It is important to listen to your body. Some days for whatever reason you might not be able to lift as heavy as the last time. Then the next week you actually go heavier again.
I attended training classes for 2 months before really lifting any weights. Then I increased the weights under supervision until I could lift very heavy weights. I can now deadlift my own body weight, back squat 91% of my body weight and am still improving. I had never lifted weights before starting the program. It feels good to feel strong and capable :)