That article is one big landmine for people without the scientific background. Genetics can give you the propensity for a natural advantage but you express you

That article is one big landmine for people without the scientific background. Genetics can give you the propensity for a natural advantage but you express your genes differently depending on your environment and your lifestyle. Years of training will improve both your enzymes and mitochondria I also thought the lactate buildup comes from anaerobic exercise, which is not what any long-range runner relies on anyway. (I wonder how you replenish electrolytes, not to mention energy storage, on a multi-day run without eventually getting stomach cramps and other GI issues? From the picture, he already has very little body fat)