Going under the knife

Ariel Sharon will be going under the knife on Thursday to fill the hole in his heart. The joke going around Israel is the surgery is actually to look for a heart, as people noticed it has been missing the past few years. He should be out of commission for a day or two then back to work.
Funny thing is, if anybody else was having this type of surgery, or recovering from a stroke, they would be told by the doctors that they have to stay off their feet for a week at least and take it easy for 6 weeks. Sharon can go back to his full schedule after a day or two. What is it about him that makes him much stronger than normal people? Anybody with his height:weight:age ratio would have been dead already many times over from cardiac arrest and super high cholesterol, but Sharon keeps on going...