Let's talk about Pranayama.
I think it is a bit confusing when people think of the practice. In yoga classes, there might be a few minutes dedicated to breathing, but very rarely do we go in-deppth into what it is for. Traditionally, pranayama is not meant to be taught until the student has advanced to a certain point and is ready for the powerful effects it has on the nervous system. I think that basic pranayama practices can be learned at any level, with the practitioner moving slowly and not over exerting themself.