For this video I placed a chair over the slave - with one leg on his stomach - and then just sit down on it. The leg sinks deep into his guts as I grab my book and just start to read. Sometimes I place my feet on his chest or face, sometimes I just have them on the floor - but he always gets the full pressure on his stomach :-) In between I get up a few times, walk over his chest and face - and then sit down on the chair again :-)