I attended Osteostrong for a few months. As hard as I tried, I could not increase my strength on the machines. I was told by employees that it didn't matter - that you did not have to reach the "Rapid Growth Trigger" in order to grow bone. (Rapid Growth Trigger is considered a level of "7"). I asked what level I had reached and they told me 2. Later, I read in Osteostrong's own literature that you needed to reach a level of at least 4.2 in order to trigger bone growth. No one told me this, and I'm very angry. Since I do not work out in the gym or do anything else to increase my strength, I could not see how I could ever reach a 4.2 -- almost double the 2 level that I was at. Why would my strength double? It wouldn't, and so I would never grow bone with Osteostrong.