This folklore was collected from my mother, who told me about a slumber party ritual she would do with her friends when she was younger. So, this would have taken place in the late 1970s, early 1980s.
“At slumber parties with pre-adolescent girls, there were a couple of stories, rituals that were passed on from generation to generation. One was a story that the group of 5-8 girls could lift one of the girls up over their heads by using only their fingertips. In order for this to work, all the girls in the group had to concentrate solely on the task at hand and chant ‘light as a feather, stiff as a board’ over and over. The girl who was subject to the lifting started off lying flat on her back on the floor. The other girls encircled the subject and puts their hands underneath her, touching only with their fingertips. As the chanting beings, the group attempts to lift the subject up off the floor until she is suspended above the heads of the others. If this was unsuccessful (as it always was), it was due to one or more members of the group lacking proper concentration or belief…. There was always the accompanying story that someone had succeeded before… or someone’s older sister had told the tale of a successful lift”
I had never heard of this sleepover game/ritual before, so it might be specific to the area/time period my mother grew up in. Or, perhaps it became less popular because it never worked. Another slumber party ritual my mother mentioned to me was the “Bloody Mary” chant, which is well-known (I heard about it from other kids when I was younger) so it was interesting that this wasn’t a familiar piece of folklore within my generation.