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I can't say that these routines will make me a mega-effective weapon, but at least they clear my head, and I work better when I incorporate the same things into my day:
for example, an hour of exercise (physical activity)
a daily walk outside I've noticed walking among several founders who also have a fairly sedentary job at a PC when they develop
at least 7 hours of sleep
a bar of dark chocolate (it contains quite a few important nutrients zinc, iron etc.)
Is there anything interesting in your repertoire that improves your performance? It could be completely "negligible" hacks.