Volkanovski used to weigh 216lbs and compete as a hooker in rugby league. He is used to dealing with a lot bigger guys than he is dealing with in the ufc. I've played rugby league myself for a long time. its a tough sport and to play and in the position he did is one of the toughest positions to play. It would be the equivalent of playing a defensive position in the NFL but these FW must seem small and weak to what he is used to. Thats why he could shrug the submissions Against ortega. He wasn't even at A level in rugby league playing in a minor league in Australia. I think rugby league background is a good base for mma (tackles) takedowns, wrestling etc are all basically part of the sport plus 80 mins of none stop cardio.