#2 The travel
Not only is the WWE schedule gruelling, but it also takes place across the world. Before you can get accustomed to a new time zone, you have to get into the ring and compete. And then, fly to a brand new time zone again.
I've personally seen a whole bunch of WWE superstars jet-lagged and exhausted during their India visits, barely struggling to keep their eyes open. And only minutes after they arrive, they have to lace up their boots and perform before a packed arena in front of many screaming fans. While the UFC has a fan base all across the world, the travel is a lot less trying.
Even though it's the dream of many a performer to get a chance to perform across the world, I wonder if sometimes the travel doesn't get to them. In some ways, it is absolutely inhuman.