I tend to focus on three reference positions with the younger hitters:
1) Setup (grip and stance),
2) Toe touch,
3) Contact.
I use RVP and will certainly work with hitters to correct flaws at any of the traditional points but, as I've tried to point out in this thread, when it comes to weight transfer and hip movement, many of the kids I've worked with seem to do it well naturally with a sidearm throw. Translating that into something they incorporate into their swing is a different matter. I find doing "matrix" style progrressions helpful for working with the kids on upper body and swing plane issues. I haven't been very successful using them to try and teach lower body movements.
1) Setup (grip and stance),
2) Toe touch,
3) Contact.
I use RVP and will certainly work with hitters to correct flaws at any of the traditional points but, as I've tried to point out in this thread, when it comes to weight transfer and hip movement, many of the kids I've worked with seem to do it well naturally with a sidearm throw. Translating that into something they incorporate into their swing is a different matter. I find doing "matrix" style progrressions helpful for working with the kids on upper body and swing plane issues. I haven't been very successful using them to try and teach lower body movements.