Why does it seem like we can improve our bench press, minutes-per-mile, or alcohol tolerance much more than we can increase our IQ? Can a person with a 100 IQ get a 120 score after training? 130? Seems quite believable to me.
My gut says it's possible. All living species are adaptable. There are definitely before-and-after pictures on the internet of muscular dogs and horses though most of those are attributed to supplements.
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My intuition is the opposite - training burns calories for no other goal than to improve physical performance in the future to gain a better ability obtain calories (or avoid predators) - evolution would select strongly against Only humans have the reversed selective pressure
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Basically, always give you the minimum performance that keeps you alive to minimize calories *then* add on muscle as needed to perform the needed labor to keep you alive. Humans have a very weird environment compared to animals.
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