The dude is a fucking freak of nature man. He was like damn near 300 pounds in his WWE heyday, and was not only the strongest guy on the roster, but the quickest too.
Not only did he have body and muscle mass, but he had speed.
Also, not only did the dude nearly die twice and return to the UFC, but he nearly killed himself at Wrestlemania 19 10 years ago. He botched a move, fractured his neck, and still managed to stand up, throw his opponant on his shoulders and use his finisher and pin him.
Oh and that move he botched, was not a simple wrestling move. It was a motherfucking god damn Shooting Star Press. AKA, a flying forwards backflip.
<iframe width="560" height="315" src="https://www.youtube.com/embed/zFU87Gg-wIU" frameborder="0" allowfullscreen></iframe>
He was 270 pounds at the time, and still managed to do a flying backflip almost 10 feet across the ring.