A lot of knowledge in any kind of an organization is what we call task knowledge. These are things that people who have been there a long time understand are important but they may not know how to talk about them. It's often called the culture of the organization.
They both go together you can't be in front of the camera hosting a fitness television show in front of 75 million households and not have trained 6 days per week year round - in a bikini no less.
