These threads that have to do with athletic ability fascinate me a lot, precisely because I think that in modern tennis it is as important as the efficiency of the fundamentals, which are often closely related. For example, the faster you move, the more coordinated you are and the easier it will be to hit the ball well.
Having said this, I think that no one actually indicates Sinner as the most athletically gifted on the current circuit, at least for my part, in this respect I certainly prefer Alcaraz to him.
The fact remains that year after year Sinner has made great progress especially on a physical level and has now certainly become an elite athlete.
His progress in terms of performance is based above all on his physical progress.
He is increasingly quicker and more explosive, this translates into a less foul-prone game (arriving a few fractions of a tenth of a second earlier on the ball) combined with a greater ability to know how to defend himself.
I notice that you put Zverev above Sinner and here I don't really agree.
Aside from the fact that in my opinion Medvedev, given roughly the same height, moves better than Zverev, the Russian is also, in my opinion, a better athlete than the German.
But if the comparison is between Sinner and Zverev, I wonder in what physical aspects is Zverev superior, apart from having greater strength?
Zverev, for being about 2 meters tall, is a super athlete, very fast in the short, great mobility in general, excellent coordination, but at the same time these are all aspects where Sinner, who is shorter but not that much shorter, is better than him.
I don't even agree with Djokovic's first position, or rather, if the ranking is based on the absolute, then Djokovic can be said that in his peak he was an athlete superior to perhaps any other active player, but if we base it on today, then the Serb is no longer in a top 5 and perhaps not even in a top 10.
After all, he, like all those who reach the final stage of their career, gets there knowing how to play tennis better than he knew how to play 5/10/15 years ago, the problem is that physical decline cannot be compensated for indefinitely by this mastery of an increasingly advanced technical repertoire, ergo, if Djokovic were still athletically the most gifted player on the circuit he would also be unbeatable or almost, precisely by leveraging an advanced game.