Just as having a good coach is an essential component of excelling at a sport, having a good teacher is an essential part of learning a language. However, as every great athlete knows, to truly become one of the best in your field, besides all of the physical conditioning, all the drills and all of the technical corrections that your coach will put you through, you have to go out and play the game – no correction, no finesse – just hours and hours of game time under their belt. They need you there to help them do it.