It's important you recognize you're isolating the "Blast" phase of your swing. It's most important part of your swing, where you, "Blast" your core/hips to hit deeper contact zones for power. You are working on a particular pitch type. In this case, "deeper contact," against a power pitcher with a "hard fastball."
Isolating your Swing Blast
You won't be starting in your regular baseball stance. If you're a guy who starts with his hands up high, you're going to drop them down. If you stand narrow, you'll need to spread out.
Imagine you are hitting is a game
You are isolating the spot after you stride and plant your foot. At the same time your back elbow re-connects with your body, returning after separating on your load. Now imagine the pitcher has released the ball, and you're making your decision whether to swing.
Blast Batting Stance System Check
For the first 40-50 swings always monitor your position relative to your marks on the ground. It may appear to be monotonous. However, it's important to train your brain to run on auto-pilot in a game, to achieve this you need repetitions.
Create Your Back Foot Marker
Before you start your LASER Blast Isolation drills, mark two spots on the ground. To assist with balance, rotation and bat speed, double check your back foot points straight.
Spread out to just past shoulder width and take another step. Starting from this position reduces the influence of your upper body to isolate your, "Blast."
Create Your Front Foot Marker
Now make a second for your front foot. Make sure it's also straight. If it's open, you'll; "pull off the ball."