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why chess players stay fit !

doesn't say why their heart rate and blood pressure increases. I assume their brain needs more energy, the fitter they are, the better equipped they are to feed their brain.
I do not know if it is a general rule, but yeah it is said exercise improves cognitive function.
Nimzovich, Botvinnik and Fischer already recognised that. Now all top players have physical coaches.
I think even Lasker was into physical training
I think Lasker MAY have written about staying fit in the book - Kampf
Does nepo have his own fitness coach too??

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