"Slower than that is not useful training for Olympic events." Lydiard-ians would disagree - at least for a base phase. But I will agree that if you are runnin

"Slower than that is not useful training for Olympic events." Lydiard-ians would disagree - at least for a base phase. But I will agree that if you are running even 7min/miles for your easy and recovery runs, many get injured at 100 miles a week. Many do. And that disrupts their development in the worst way possible! Interesting article on that: http://www.letsrun.com/news/2006/09/wejo-speaks-why-i-sucked-in-college/ http://www.letsrun.com/news/2006/09/wejo-speaks-why-i-sucked... But sure, I also agree - ultras versus marathons are different types of limits. Or mountain races versus marathons versus something like an ultra like Badwater.