Well if you trained to the point where you don't feel pain anymore then my point is irrelevant and of course you'll be bored. Also I think your abilities are o

Well if you trained to the point where you don't feel pain anymore then my point is irrelevant and of course you'll be bored. Also I think your abilities are outside the spectrum of normal. If you ran 6 miles a day for a week that'd be 42 miles per week. If you look at this article http://www.active.com/health/articles/why-too-much-running-is-bad-for-your-health http://www.active.com/health/articles/why-too-much-running-i... 20 miles per week is the recommended sweet spot. I think if you can hit 42 miles per week without accumulating any wear and tear on your body then you're one of those people genetically predisposed to for cardio.