Since getting this CO2 meter, I’ve found there’s a high correlation with being unfocused and/or irritable with 800+ readings. Reminder to get some fresh air, open the window, etc.

Wow, super cool to see new metrics like that.

I don’t have numbers for it but another tip: if you find yourself very productive at a coffee house or library, often it’s the chair and desk they set up.

Sometimes if it’s good enough, you can just note down the brand and buy your own.

Copy the ergonomics.

Very missable detail but I have noticed that the table height while sitting makes a world of difference. 

A few inches up and down just changes the entire mood / flow.