https://community.usms.org/swimming/f/general/11031/new-study-on-running-and-heart-healthFull story: Running May Be Harmful to Your Heart Running May Be Harmful to Your Heart By Lisa Collier Cool Nov 30, 2012 Running, long considered a healthy hobby, may actually be dangerous for some. At least that’s the prevailing opinion ofen-USTelligent Community 12https://community.usms.org/thread/181602?ContentTypeID=1Wed, 05 Dec 2012 14:48:09 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:d027c485-3f1c-42c3-92a8-1c00ca7365cdFormer MemberI do wonder sometimes and actually have asked it on here. I wondered if you do extremely hard workouts(especially sprint work outs), if there is the danger of overdoing it because it sometimes feels like I just overdid it and might drop dead in the shower:D Having said that, the fittest I ever was was my time as a bike messenger, cycling around 80-100 miles per day on a daily base. The first few weeks were tough until my body adapted and then I felt great. Even after 10 hours of cycling, I would take a coffee break and then hop back on my bike full of energy because I recovered much faster. That&#39;s when I realized that your body is capable of more than I imagined. I can&#39;t say if cycling 10 hours per day or training really hard left some sort of scars or damaged my heart tho and if that was unhealthy. It does make me feel anxious when I think about the possibility but I tend to be a hypochondriac anyway:(<div style="clear:both;"></div>https://community.usms.org/thread/181577?ContentTypeID=1Tue, 04 Dec 2012 09:55:33 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:23264008-d5de-45cc-90ee-a22203e1aef3mcnairI read those links on Fort&#39;s blog too... I noticed they didn&#39;t mention anything about diet. I used to feel like I could eat anything and get away with it because my weight was held in check by 40-50 miles a week of running. In fact, you have to eat a ton just to avoid bonking every day... but it matters what you put in your body. Are high-mileage endurance athletes negating some of the effects of their cardiovascular fitness by overindulging, thus bringing them in line with their not-so-fit peers? Who knows... nothing about comparing diets in any of those studies. Also, there&#39;s a big difference between training for a marathon or ultra and actually running competitively in one... running competitively in ultra events takes an enormous toll on the body. I wonder how different the results would look if they separated out groups by the frequency with which they competed (as opposed to the frequency with which they train). I always felt pretty good the day after a long training run, but might feel like crap for a week following a race.<div style="clear:both;"></div>https://community.usms.org/thread/181549?ContentTypeID=1Sat, 01 Dec 2012 03:33:06 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:d0d6fbc5-3ae0-47d1-ae74-921771889d70SojerzFort posted on her blog the link to this respons by Runners World: <a href="http://www.runnersworld.com/health/too-much-running-myth-rises-again?cm_mmc=Twitter-_-RunnersWorld-_-Content-Blog-_-SweatScienceTooMuchRunning">www.runnersworld.com/.../too-much-running-myth-rises-again</a> Wondering who to believe.<div style="clear:both;"></div>