So now they say endurance exercise is bad for you?

Dr. Mercola doesn't exactly has the best reputation out there.

There is this tidbit of info: "Mercola has questioned whether HIV is the cause of AIDS . He has argued instead that the manifestations of AIDS (includingdeath) may be the result of "psychological stress" brought on by the belief that HIV is harmful".

But Google him and come to your own conclusions.

Thanks for that, I sent a few articles back to my friend. 

Good point, although he is very active he is not into endurance sports. 

i discredit the entire thing based on this sentence:

that's the hole point behind strength training.  load your muscles up with enough resistance to cause microtears.  when your muscles get "sore", this is why, soreness is from the microtearing.   if they are so far off base about this simple of a concept i can't really trust anything else they claim.

I vaguely remember hearing about Mercola somewhere before, and it wasn't a positive reference.

I'm all kinds of curious as to where he gets his information, or if there is valid reference material for it. I got the impression he uses factual information, but takes it out of context and leaves out anything that isn't to his benefit.

He uses the men of the "Marathon 100" as an example?  And then points out that the half of them who train the longest/hardest have heart scarring?  So he found 50 people who are the most extreme of the most extreme!  And how many people do a marathon in a year from the US?  500,000!  That is 1/10,000.  Nice sample size. 

What about people who do one marathon a year and do a "moderate" training plan?  Let's compare their (our) hearts with those that sit on the couch and are 60 lbs overweight.

Just saw this. 

http://www.dailymail.co.uk/health/article-2154267/Excess-exercise-hurts-heart-cause-dangerous-long-term-harm-say-scientists.html