I start trampling the slave's weak abs under my bare feet - stand on only one foot with my full weight, stand on my tip toes or let my heels sink deep into his guts. The slave moans in pains as his abs give in and my feet sink deep into his belly - but I continue anyway. I ask him if he needs a break - but obviously it's not going to be a real break - maybe I should stand on his face or his throat instead of his belly?! :-D Then the belly trampling continues! In the end the loser tries to turn his body away - so I just flip him over completely and trample his back for a short time!