This video is very good. I have only two minor comments. This swing is intended to get air under the ball. The hitter wants to hit fewer ground balls. This is a dangerous goal because when you design your swing for flight, you willfly out more often (there is nothing wrong with ground balls as long as they are ht hard). So the instructor is trying to get the hitter to raise his front or leading shoulder above his back or trailing shoulder. That causes the lift in ball flight. Everything else in this swing is very good