As noted in previous posts here and here, the myth that endurance training and long-distance running are good for one’s health remains firmly entrenched among most Americans, despite sad reminders such as this. In this timely article, Mark Sisson lucidly explains why endurance training is hazardous to one’s health. Here is a snippet:

The problem with many, if not most, age group endurance athletes is that the low-level training gets out of hand. They overtrain in their exuberance to excel at racing, and they over consume carbohydrates in an effort to stay fueled. The result is that over the years, their muscle mass, immune function, and testosterone decrease, while their cortisol, insulin and oxidative output increase (unless you work so hard that you actually exhaust the adrenals, introducing an even more disconcerting scenario). Any anti-aging doc will tell you that if you do this long enough, you will hasten, rather than retard, the aging process. Studies have shown an increase in mortality when weekly caloric expenditure exceeds 4,000. [. . .]
Now, what does all this mean for the generation of us who bought into Ken Cooperís “more aerobics is better” philosophy? Is it too late to get on the anti-aging train? Hey, we’re still probably a lot better off than our college classmates who gained 60 pounds and can’t walk up a flight of stairs. Sure, we may look a little older and move a little slower than we’d like, but there’s still time to readjust the training to fit our DNA blueprint. Maybe just move a little slower, lift some weights, do some yoga and eat right and there’s a good chance you’ll maximize the quality of your remaining yearsÖ and look good doing whatever you do.