This is an awful lot like the idea that the only thing keeping people from raping and murdering is belief in god. It says a lot more about the person claiming it than anyone else.
We’ve become so successful at getting food, we don’t have to move much to do it any more. So we have to go out of our way to be active to stay healthy since evolution takes so long to catch up.
But what if they cremate you? Better be safe and also swallow some mercury zinc batteries so your corpse will explode during cremation if they go that route.