I am with RichMahogany. Of course they stretched. Even the little house on the prairie kinda pre-industrial agrarian ancestors did, if not a conscious routine.
My cats don't move after waking from a nap without first stretching. I thought this was like a common thing. I stretch similarly just when I wake up or get out of a chair. It can't be some kind of modern hypnotically-commanded memetic replication behavior that is entirely learned, like reading or something. It is a property of bodies with joints and musculature.
"Ah, those endless forests, and their horror-haunted gloom! For what eternities have I wandered through them, a timid, hunted creature, starting at the least sound, frightened of my own shadow, keyed-up, ever alert and vigilant, ready on the instant to dash away in mad flight for my life. For I was the prey of all manner of fierce life that dwelt in the forest, and it was in ecstasies of fear that I fled before the hunting monsters."
Jack london, "Before Adam"