Succinctly put by Marc Lewis of the School of Communication Arts, London.
You are either 'flying' : in which case, watch out world, your are taking it by storm!
Or 'gliding' : in which case, you are coasting along well inside your comfort zone, happily underachieving and not challenged.
Or you are 'diving' : you are heading towards the bottom. Nothing you do is right and you have no idea how to get out of this mess.
There's been research on this kind of thing for business school students.