> If all that isn’t convincing enough to turn you onto weights, perhaps this is: maintaining strength later in life “seems to be one of the best predictors of survival," says Peterson. “When we add strength...almost every health outcome improves.”

This sort of thing is repeated a lot, but isn't this just a correlation? We don't know which way it goes. Maybe sick people get weaker, rather than weak people get sicker. That makes just as much sense.