Most likely drugs =) Seriously?! I doubt his training's any different from the ones u get from coaching in public.
i'm sure it's more intense and hard.and i would love and follow the drill routien but i dont' think i can survive it.
but they do have dope testing in tournaments.. unless he is using it during training which needs time to fade away in his blood stream thats why he needs to skip so many tournaments before a major one but we can only speculate... this china super league is a new test?