Good stuff. One thing I find helps my productivity is to take time to exercise (run or lift weight on alternating days) in the middle of my workday. It's a nice break and tends to spark creativity.
Absolutely! Exercise increases blood flow to the brain, and promotes neurogenesis too! Meaning that your brain can learn much more easily in the long run. I wrote a bit on neurogenesis here:
https://therevisionist.org/bio-hacking/cognitive-function/#H...