100 miles a week will tax the bio-mechanics of most people in the first world. Granted doing those 100 miles at 10 min/mile is far, far easier than doing it at

100 miles a week will tax the bio-mechanics of most people in the first world. Granted doing those 100 miles at 10 min/mile is far, far easier than doing it at 6:00 to 7:00 pace. And doing lots of LSD (long slow distance) DOES have proven physiological effects. But please don't treat 100 mile weeks as some trivial task. I have been running for > 25 years and have run from a 4:40 mile to a 2:44 marathon and 1:15 half and my max week was 84. I was doing consistent 70 mile weeks in college for a while and finally couldn't continue due to injury. I do agree with your core point that most people have no idea what their true limits are. I have seen friends who hated to lose pass out at the finish line of a race. I find I don't even improve until I hit about 40 miles a week with at least one LT run of 4 to 6 miles and a >= 13 mile long run. That only takes about 4 to 5 hours a week (not including extra showers, drives to runs, necessary strength work, etc.) I guarantee most spend far more than that on Netflix et al. P.S. Congrats on your race!