1: Approach in Practice > Approach in Game
You are in control during practice, from when you start hitting off the tee to when the coach throws BP. Because you are in a controllable environment, this is a perfect time to start working on your approach.
I am a big believer in starting out your round hitting to the opposite field. It forces you to let the ball travel a little bit longer and takes discipline.
A question I will ask players is, what do you struggle with?
Most of the time, it's something like, "I'm consistently rolling over."
"Great, what have you been doing to work on that?"
Usually, the answer is some random drill.
If you're rolling over during the game, you need to make sure you're training in a way that prevents that from happening 'during practice.'
When the game rolls around, you're in reaction mode. In the back of your mind, you may be thinking opposite field, but we want to have already trained that. Which is why have an approach in practice is so important.
Here's Donnie Ecker, an MLB coach for the Rangers.