Originally Posted by kiteboard
No coach I've met knows about lull-jam-finish modes, or defense of contact point in an arc. That had to be learned the hard way.
I think perhaps because those are terms you've made up (at least in respect of tennis). I'm sure the majority of coaches understand defending, trading and finishing for example.
I'm still at a loss to understand how you achieve any of the things you have listed quickly - there are certainly plenty of ways to improve there, but how many can be achieve quickly?!