I reserve the last 10 minutes of class to do cooldown exercises. I
frequently suggest stretches before bed and again the next morning for
my class members. I also use the cooldown time to verbally review the
figures, steps, and dances we covered that evening. So you now know
one teacher who does cooldowns. My class starts with warmups
promptly at 7:30 and ends promptly at 9:00, occasionally running over by
5 minutes, specifically so I can do cooldown exercises if I spent too
much time finishing the last dance. This is not the norm for SCD classes,
I think more teachers would do them, but the average social class
finishes not with a bang but a whimper as people start drifting away
homeward until the final few die-hards leave at 10:00. WIth this
arrangement, the teacher has no reason to do cooldown stretches.
There's usually nobody left to do them!