When teaching an amateur hitter or working on your own swing, it is easy to cloud your brain with thoughts. In a normal training progression, going from tee work, to front toss, to live BP, you need to progressively think less mechanics at each stop. I use a strategy of one sentence on the tee, one phrase off toss and one word on live BP to guide my communication.
How to Communicate Hitting Instruction: One Sentence, One Phrase, One Word from Elite Baseball on Vimeo.