Nice work! I also have master's degree in engineering, IT diploma, software developer consultant, basically retired but studying Ethereum solidity right now lol :) For guitar try to relax (breathe slowly in and out) and notice if you are tense. Start slow with metronome and build up the tempo gradually as long as you can keep playing everything perfectly. Lots of sloppy players out there because they tried to play too fast too quickly.
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Seems like you are a jack of all trades then, just like me. When I play fast I can not relax because it is too fast, I really wonder how people barely move their hands when they are picking!
But I fully agree with the speed thing, gotta practice till it becomes 2nd nature... like the guitar belongs to your arm...
Yeah efficiency is important. I use my wrist mostly also I use my pick and fingers sometimes to skip strings and also 'economy picking' two downstrokes on two adjacent strings rather than alternate picking, not to mention sweep picking. Eventually your brain does it without thinking.
For diet I do plant-based low protein, people think they need lots of meat and powders which is untrue and not healthy. I'm 48 so I think about heart disease, etc and learned about saturated fat and cholesterol. :)