I think only proper metric is "future quality of life". Sitting on couch watching TV - you are sure it is not going to contribute to your well being in 10-20-40

I think only proper metric is "future quality of life". Sitting on couch watching TV - you are sure it is not going to contribute to your well being in 10-20-40 years. To be able to do some pushups while you are 70y.o. - you have to do hundreds of pushups while you were 20y.o. I don't know anyone who wants to have a heart attack or spend his last 5-10 years of life in a hospital bed. So I am not writing about quality of life like getting a Porsche, because grabbing coffee with a friend or home brewing won't land you that. Having a habit of doing something, walking somewhere gets you going and if someone hits 70y.o. and they are couch potato, they will be in for a world of pain. Where if they would grab a coffee with their friends from time to time do some hobby they will have some lasting relations and stuff to do. Well I suppose it is not trivially refutable - but happy to see what would be the refutation.