Jeffrey-
I used OS exclusively for 8 months, in the beginning I made improvements, then I locked up worse than before. I will take responsibility for this and not claim that it is impossible to fix through those specified regressions alone. I went to the OS seminar and learned a lot, and have nothing but respect and admiration for Geoff and Tim. Two very strong and admirable men and I'm blessed to have met both.
OS, the FMS, and many other systems of practiced are based on the neurodevelopmental sequence, the blueprint for how we all learn movement. We need mobility to gain stability and motor control. You can't compare yourself or anyone to an infant as they have unlimited mobility as they haven't had to compensate for years or decades like adults. They don't have tissue and/or other serious issues and are clean slates upon which they can learn stability and motor control.
Why did I lock up? Because my mobility was SEVERELY compromised and mobility is needed before stability and motor control can be attained. I don't see how my hips and shoulders would have ever improved through the specific OS resets alone as I was in desperate need of A LOT of deep soft-tissue work to gain mobility along with specific postural work. I've also needed manual therapy techniques to unlock my shoulders, hips and ankles which upon reflecting have been compromised since I was playing little league and basketball as a child.
I still roll, rock, occasionally crawl a few paces, when appropriate, along with many other postures and movements that some amazing people have taught me. Since I expanded my personal movement practice my FMS has gone from around a 9 to around a 16 and my SM issues of the last 20+ years are close to being resolved. My SM was horrendous, 2- / 1- if such a thing was possible.
I'll reiterate that I do not fault OS for my movement regression last year so as not to offend anyone