Daniil Dubov is a notable Russian chess player.
From a recent 2020 interview, he shared this money quote:
In general, I think that the competition is not so great in chess.
If, to put it crudely, you ask me how many people in the world: a) work at least 4-6 hours a day long-term, b) take care of their physical fitness, c) have a strong-willed character, a desire to fight and win, then I’ll surprise you. There are maybe 5-6 people like that in the world – who manage to combine it all.
And among those, he’s the best.
The interview is a good read in full, take the time to read it.