A ways back I said sitting is bad for you.
I was talking about sitting at a desk all day, but I mused that meditation retreats, during which one may sit on a cushion for 8-10 hours daily, might be bad for us in similar ways.
I actually doubt that (though I obviously don’t know for sure). The studies of office workers examined subjects who sit 8 hours a day or more, five days a week, 48+ weeks a year, year in, year out. It’s hard for me to believe that a week on sesshin could shorten one’s lifespan if one isn’t sedentary during the other 51 weeks of the year.