Dr. Steven M. Platek presents a scientific argument in support of the idea that naturally designed movements produce naturally attractive physiques.
Evolution has favored certain movements in different animals because those behaviors have produced two essential outcomes for possessors of the requisite species-specific movements: survival and reproduction—more specifically, being selected as a mating partner.
For example, the kangaroo and the rabbit (or hare) hop. Big cats (lions, tigers, cheetahs) sprint and pounce. Each of these species-specific behaviors has evolved because it has produced a survival advantage: a rabbit that does not hop fast becomes owl food, and a cheetah that runs too slowly starves. It’s hard to reproduce when you’re dead.
However, we often miss the other side of the evolutionary equation: these behaviors don’t exist only because they produce favorable survival adaptations but because the favorable survival adaptations they produce are sexy.
What does any of this have to do with fitness training or CrossFit? Generally, physical fitness training is focused on producing a physique that is found attractive to another person, but traditional fitness programs are missing the point: survival is sexy, and from nature’s viewpoint, survival demands functionality.