I know much about Karelin. He is more myth than anything. Most of his training is denounced. He claims to do very little training. Yet he does similar movements used in OL. He also runs in deep snow in Siberia. I dont think much will be known about how he trains because he wants it that way. They guy is the best Greco wrestler EVER...and maybe athlete. His only loss was with a busted shoulder and torn groin...and he ALMOST won. He was close to 14 lbs when he was born. I think we can just chalk him up to legend.