There is no way for most people living at a mile high or lower to accurately guess how their body will react to the extreme altitude of Everest. People who can run Ironman races and Death Valley marathons still die from breathing issues and heart attacks at 27,000 feet plus above sea level. The lung and heart issues can’t be tested for these weaknesses at the near sea levels most of the earth’s population lives in. It seems like a tragic gamble for all these low altitude born and raised athletes to decide that they are fit for strenuous activities in high altitude/low oxygen environments. Win the gamble and you have a story to tell at social gatherings, lose the gamble and you are dead.