Marathons select for people with health, energy etc and put them through a 6+ month cardio training regime. But the 5 hours of a marathon have a greatly elevated rate of cardiac arrest - because the strain of running a marathon more than compensates.
Personally, I'm quite surprised to learn the week-long desert drug orgy with experimental buildings and art vehicles and 70,000 attendees regularly has no deaths.
Marathons select for people with health, energy etc and put them through a 6+ month cardio training regime. But the 5 hours of a marathon have a greatly elevated rate of cardiac arrest - because the strain of running a marathon more than compensates.
Personally, I'm quite surprised to learn the week-long desert drug orgy with experimental buildings and art vehicles and 70,000 attendees regularly has no deaths.