Humiliating The Slave During Workout

I order the slave to do a workout while I witness him closely - and humiliate him! I want him to be fit enough to serve me - and to make it even stiffer for him, Im going to sit on his face in inbetween his workout. Hes already fatigued, so its much worse for him than usually! But of course, even thats not mean enough for my taste - so I tell him that I wont get up - if he wants to breathe, hell have to lift my full weight up in inbetween! The loser has to fight for every little bit of oxygen!