Originally Posted by BevelDevil
Del Potro isn't the best model for who?
When you learn a basic movement, you don't necessarily need to be emulating a pro. His take back is pretty lengthy, rather disconnected from his unit turn and he doesn't reach optimal position to swing forward. If anything, it risks to be HARDER to be competitive with that. I told you... the simplest way to ensure a consistent contact with a high power swing is to pronate at the end of the take back -- end of the discussion. It's not harder to pronate or to supinate
; what's hard is what you'll have to do with your racket head in the forward acceleration if you don't pronate.