When I started taking golf lessons at The Tuxedo Club under Dave Carazo all we had at that time was a computer and video and a book on his shelve like Ben Hogan 5 lessons. Now we have force plates, still video of tour players on Trackman which I use at Golf Galaxy. Plus there is Gears, Sportbox, Kvest, 3D motion like my friend Dr. Rob Neal coming soon 4 D Motion. All are helpful but we need to be careful how much is to much. If I’m teaching a golfer just starting we introduce them to it where an advance player may want more. Happy New Years