The fisherman doesn't sit in a chair all day either. the body being the interface to how we feel psychologically, he has a much easier time staying fit, Not squishing and collapsing down on his organs after a 2hr coding flow session, reducing blood flow and helping bring to fruition the effects all those 'sitting for prolonged periods at a desk will lead to cancer' studies. I also wonder how being outside on the water/nature effects the psyche to feel relaxed and in tune. Vietnamese are way ahead in terms of health hacks too. Almost no one in the west knows that you shouldn't be drinking ice cold beverages with your meal as it inhibits proper digestion , but any common folk in Hanoi etc will stop and seriously inquire to why the hell you just downed that glass of water WHILe your eating your beef/rice fermented cabbage roll lunch ? Why not before the meal , (cause it increases hcl production priming stomach for digesting upcoming meal etc ) And yeahbdownsides are definitely there , most people in Hanoi have a small persistent cough because of air pollution