ExRx.net

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

"Extreme exercise such as marathons may permanently damage the heart and trigger rhythm abnormalities, warn researchers.
They say the safe ‘upper limit’ for heart health is a maximum of an hour a day - after which there is little benefit to the individual.
A review of research evidence by US physicians says intensive training schedules and extreme endurance competitions can cause long-term harm to people’s hearts."

I've been saying for years - cardio hurts the heart.

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Thanks TimD.

I've always thought marathon running was dumb, personally.

Cardio also hurts the brain.

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Our greatest fear should not be of failure, but of succeeding at things in life that don't really matter.--Francis Chan

As much as I think that long duration cardio is counter productive, I haven't heard this. It's the endorphin rush that chronic cardio fans are looking for and it is addictive. I haven't heard that it's harmful though.

Here's a related article. http://blogs.scientificamerican.com/sci ... ners-high/

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Let thy food be thy medicine, and thy medicine be thy food.~Hippocrates
Strength is the adaptation that leads to all other adaptations that you really care about - Charles Staley
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Thanks TimD

If I use a squirrel-cage machine for more than a minute my brain starts aching. Maybe it's my mind that hurts. Whatever, I can't stand it and have to quit.

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Our greatest fear should not be of failure, but of succeeding at things in life that don't really matter.--Francis Chan