Playing cards and the bench???

I have been going to gyms for years, 3-4 times a week, however I went earlier this week and saw something I dont get: the guy was using a bench to do some work with dumbells, and he had 4 stacks of playing cards, face down with about 3 or 4 cards in the stack, behind the bench where his head was... on his right, on the floor there was another stack of playing cards with one card face up... he was there for a good 20 minutes, then I lost track of him... anybody know what this is?