I.) New teachers and coaches often over-rely on their personal experience. In other words, one may think that the skills that came easily for one will be a piece of cake for one’s students as well. Conversely, such a teacher tends to be more sympathetic and lax when it comes to skills that kicked his or her own ass. This may work for some students, but it’ll be way off the mark for others. There’s a risk of pushing students too hard on skills that may be dangerous for them, and / or not helping them achieve a breakthrough that they are capable of because of one’s own baggage.
II.) The next level of coach recognizes that there are different body types. Such teachers put this knowledge to use in determining what skills present greater or lesser risk for a student given the strength, power, speed, flexibility, etc. associated with such a body. This coach will recommend modifications and capacity building exercises based on the student’s body type.
III.) Then there is the coach or teacher who can see the individual idiosyncrasies of a given student’s body and make recommendations based the unique conditions, strengths, and weaknesses of a particular person.