Here’s a good article with thoughts from Francis Roig, Rafael Nadal’s 2nd coach.
He is one of the smartest minds in tennis.
Francis is based in Barcelona at BTT Academy, Barcelona Total Tennis. One of the best academies in Spain.
I’ve trained with him and his is super tough, too!
Makes you suffer…
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https://www.atptour.com/en/news/nadal-roig-analysis-us-open-2019-tuesday2
“We have to constantly improve; it isn’t just about his overall game, but his ‘feel’ for the game,” Roig told ATPTour.com following Nadal’s practice. “That’s not something that happens overnight, or you just happen upon. It’s the next step of improving one’s game. His ability to listen and absorb is extraordinary. It’s a virtue; it allows us as coaches to have a dialogue with him, point out specifics and know he’s on the same wavelength.”