All the kids in our area were taught straight up and straight down and out. They were taught by current major league P coaches in the off season. It is hard to tell which is better. the guy who taught my son was the head P coach for the Jays and he was emphatic about no rotating hips. My son tried last year and it really messed him up. New college P coach who thankfully is gone trying to squeeze more MPH out of him. Also developed a pinching sensation i his shoulder until I converted him back.