Yes agree but also think everyone can benefit from mental coaching. Training your mind should be considered no different from training your body. Simple example, how you react to losing possession of the ball. Have a quick mope or go and get it back again? It's surprising how many professional footballers will simply give up if it's not going their way. A negative attitude can be like poison and spread within youself and others around you. Some players are naturally mentally strong I think, like McGinn and Martinez where it reflects in their style of play. Some players have it naturally and others need to work on it.