i've told my older kids not to bother. it's unnatural and uncomfortable to me and they're nigh on adults so it's silly for them.
the younger ones, yeah, i go through the routine with them. it's dumb but i think routines are very important with younger/troublesome/bigger classes.
well if the school insists you do it, then do it. if they don't then it's up to you...SHOULD I IMPOSE OR just let them be?