Hardly. I actually went ahead and looked up the study that is quoted in the article, and it doesn't support what Chris at TNation is claiming. The purpose of the study was to determine how changing exercise levels affect age-related weight gain. The authors state explicitly that their study doesn't control for nutrition, which is considered to be a large factor. Second, the authors conclude that age-related weight gain occurs with unchanged exercise level (which makes sense, as metabolism slows as we age). Third, the authors state that the data reflects that an ANNUAL change of 1 km/week is associated with a reduction of BMI. Not that

"The only runners who didn't get fatter were the ones who significantly increased their milage, most by 3 times as much running per week."

But if we want to compare apples to apples, consider this: Running the same distance at the same pace long term is akin to doing weight training at the same reps and weight long term. You'll get your initial benefit, but your body will condition itself and the benefit will diminish over time.

I propose that weight training AND cardio are part of a good exercise plan, not just one or the other.

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