It’s what they can teach, not what they can do. Would you rather learn gymnastics from this Olympic gold medalist (Nadia Comaneci):
or this broken down old guy (her coach, Bela Karolyi)?
As another example, would you rather learn boxing from the greatest of all time:
or his broken-down-old-man coach, Angelo Dundee:
It’s great, and to be sure sometimes necessary, if your instructor can perform, on demand, whatever they are teaching. No argument. But you can also learn a lot from someone who can accurately assess what you need to do to improve, even if they can’t actually quite do it themselves.
Ol’ Angelo wouldn’t have lasted long in a heavyweight bout after all, but he molded the best.
(Hat tip to Marcus Wynne for the inspiration on this one.)
Finally: I hit this point often and hard because it’s the part of self-defense that most people foolishly omit. If you carry a gun for self-defense, you have to know the law. Invest the money you’d spend on shaving a tenth of a second off your splits with Andrew Branca’s book or seminars — it’ll pay far greater dividends. Visit this link to learn more, and use the discount code “streetstandards” for a 10% discount.
Update: Here’s the poster that I refer to in the comments, again courtesy of Mr. Wynne: