A simple thought: your personal health is worth 1 trillion times more than your productivity. in fact, if you prioritize and optimize for your health, productivity will come naturally. However if you sacrifice your health for more productivity, you will fail.
So for example, if you’re exhausted, just take a nap. Don’t force for yourself more coffee in order to become more productive. and never let guilt ever motivate your productivity either.
Only work out when you feel like it
The worst idea is to work out when you’re exhausted, or your body is still recovering. Only work out when you feel like it, when your body is in exuberant health, and with superfluous strength. better to do an intense one rep max work at once a week, then to grind every single day. better to do an intense one rep max workout once a week, then to grind every single day.