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Most of the kid under 15, 75% of the sessions are footwork, structure, not that much mutilball training before go for match. I still remember I saw him physical training for 30 mins then do some mutilball for the rest 15 mins. That's the first 2 months of got coaching.Yes, training abroad. From what I gather, kids in China don't get much particular guidance on equipment, but a ton of them use things like Viscaria with boosted/glued H3 as well. In fact beginners do a lot of practice without any racket (shadow practice).
IMO that's the right approach, at the beginning it's just about getting the right form, right technique. Whether shots land is irrelevant. It obviously would take an adult without coaching a lot of effort and discipline to advance like this, but it's doable.