This is a custom video. Xiaomeng’s head was bagged by plastic bags, and her body was tied by rope, first fixed to a bed and then to a table, both in prone positions. For each time, she must endure for 10 minutes. Of course, one can hardly survive for 10 minutes with so little air inside the bags. I poked tiny holes in the bags so that she can draw in a little bit of fresh air every time when she inhaled forcefully. Unfortunately this was not really sufficient, and her oxygen debt kept on building up, especially after I inserted a ball gag into her mouth over the plastic, which apparently blocked a few breathing holes…