10 to 15 pounds of sweat, which he replenishes with a protein and nutrient-dense sumo stew called chanko-nabe per day diet. but every wrestler is different. >> the interesting thing for most people to learn, actually, for most americans to understand, is that traditionally in japan, in sumo, you didn't have to be enormous. >> i can't do that. >> let's watch him do it first. >> reporter: regardless of size, the stretching routines are intense and give you an appreciation for the athleticism involved. >> come on, push, push, push! >> i am pushing. you push. >> when yama's ready, he's going to go all the way down. >> he is not. >> yeah, he is. he can literally go to sleep. >> reporter: if you're willing to do the work, freundt says it doesn't matter who you are. >> then the referee will ssay -- >> please don't, please. >> reporter: or how you look doing it. >> he's hard to move, man. >> let's bring the eight quarterfinalists up to the stage! >> reporter: as freundt continues working to grow sumy's presence in the u.s., he says he'd love to see it become an official olympic sport, something he fe