My short lesson for today is, be mindful of what you are doing to your body. Golden rule I try to follow, is any artificial restrictions to what is natural to our body, will eventually lead to breakdown. Period. I’ve learned it from other people and, unfortunately, from my own mistakes. 
Good systems have no restrictions against what is natural, they are tailored to individual needs, and they don’t push people too far outside the comfort zone right away. Everything has to be done in small steps.