@hammondp2 Osteostrong is controversial. Research is limited and shows mixed results. Some small studies suggest minor improvements in bone density, while others find little to no effect, and the higher-quality studies so far are not very convincing. Overall, it does not appear to be more effective than regular exercise, though it may offer some benefit for strength or physical function. At this point, it’s best viewed as a possible supplement, not a replacement, for well-established approaches like strength training and weight-bearing activity for bone health.

My understanding is that the sessions are supervised by trained staff for guidance, but they are only PTs if they happen to hire one - it's not a requirement for employment.