Coaches are professionals who provide training required to uplift one's performance, be it any sphere like studies, sports etc. With their knowledge and expertise, coaches and the coaching that they provide, goes a long way in honing our skills at that particular thing for which we seek their guidance. In the words of Alan Parasheghian, "A good coach will make his players see what they can be rather than what they are." That is the ability that every good coach has, that is, the ability to inspire and motivate the person or group of persons, under his guidance.
Great coaches have earned a lot of acclaim for their services, worldwide. The Australian cricket team has been the undisputed sultans of the game. A major credit to their supremacy in Cricket goes to their long-term coach John Buchanan. He was given an awesome farewell when he gave up his services as the coach of the team.