I coined the term myself. I am not hardcore like some runners...here are some reasons why. I am sure I will add to it.
1- I love running, but I would pick a treadmill run over an outside run more times than not. Most runners hate the treadmill and just about cry and do anything they can to avoid it. I don't. I love it.
2- Sleep is more important than a nice cool easy run. I knew I needed to get my run in today. I also knew my dad would be getting up around 7-8 to go for his run. I slept til 10:30. I left at noon for my run. Now it was a MUCH cooler day than normal, but it was still hot. I am sure the run would have been better had I gone at 7. But I love my sleep. The end.