Anyone has read "The Inner Game of Tennis" by Timothy Gallwey and applied it to badminton? http://www.amazon.com/The-Inner-Game-Tennis-Performance/dp/0679778314 CN
summary.. Performance = Potential – Interference http://www.buzzfeed.com/reeveswiede...ything-why-is-a-four-decade-old-tennis#89z7c9
The book is about the self. Specifically how one self can get in the way of another self, all within the same self. These are Self 1 and Self 2. To summarize, Self 1 is the brain, while Self 2 is the body. Self 1 instructs, Self 2 acts. We get into trouble when Self 1 tries to tell Self 2 how to do something the latter already knows how to do — when we try too hard. e.g. We hit a bad stroke (backhand) we admonish ourselves and try to self correct and soon if that goes wrong, we are in a downward spiral. The idea is to not let your brain dictate but your body do so. What most athletes call "I'm in the zone". The suggestion is to take your mind off the stroke correction. A way the book suggests is to just notice where on the racket surface the shuttlecock is connecting. The Body knows the stoke and when given a chance it will get it right.
So essentially it boils down to what Obiwan Kenobi said to Luke, "Use the Force, and trust yourself."