"In 1986, Sergio survived being shot by his then-wife Arleen Garrett. He sustained 5 bullet wounds to his abdomen from a '.38' special."

That's because his muscles were so thick and strong, bullets could make it only half way through his muscles, but couldn't go far enough to injure his internal organs or his bones.
In order to heal his muscles after getting shot, he would eat hundreds of steaks and drink many bottles of wine all in one sitting. He was a very fast healer too.
All of this has been confirmed and verified by the Japanese authorities.

