According to Wikipedia, "Planking is the act of lying face down with arms to the sides of the body, in unusual public spaces and photographing it.The term "planking" was coined in Australia and became a fad in 2011. "
I can in fact confirm that "Planking" has its origins in liturgy. It is an ancient religious act of lying on the floor of the Church during the chanting of the Litany of the Saints. It is also practised by more evangelical groups during prayer sessions. Here is the pictorial evidence of Holy Planking. Can someone please update the Wikipedia entry to reflect this research?