We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Your basic physical architecture is a product of a genetic potential, a genotype. Your genetic potential (design) is effected to some extent by environmental influences: intrauterine nutrition, nutrition during growth, disease, physical activity during growth, and so forth. All the same, your genetic potential can not be exceeded because it is pre-programmed.
What do I mean by basic physical architecture? I mean things like basic body structure: height, bone lengths and widths, and number of muscle cells and their distribution (yes, you are born with all of the muscle cells you will ever have, and these vary a good deal between people).
As an adult over age 17- 21, your life-long basic physical foundation is complete. As with your IQ, personality strengths and weaknesses, athletic talents, what we do with our given physical architecture after that point is up to us. A good trainer, a physical therapist, or a sports physician can see through our appearance and phenotype and get an idea of our basic physical architecture and our potential for development of what we are.
Our naked physical appearance today may or may not tell us much about our basic architecture, because it might be hidden under layers of fat or simply unmanifested by lack of stressors and demands. In underweight people, it can be concealed by underdevelopment of potential.
It's common to talk about endomorphs, mesomorphs, and ectomorphs, but that is simplistic because everybody is built differently. The length of your femur, for just one important example.
Do these things matter in general fitness efforts? Not too much. Do they matter in physical training? Yes, because the architecture sets limits on, and offers opportunities for, what can be achieved. Do they matter in athletic potential? Certainly, but it depends on the level which is aspired to.
Plomin reports that about 50% of behavior is genetic. Physical structure may be affected by such things as nutrition. Sociopaths are probably preprogrammed. He also writes (in "Blueprint") that some early development factors may be important early, such as child abuse, but genetics is more important as we get older.
What we don't know much about yet is the role of gut biome in such things as obesity and even autoimmune diseases.
I can tell you from experience that even trying very hard to live a good clean healthy life cannot always overcome the terrible conditions passed on through heredity. As my sister said to me while I was fighting something I inherited, "if you hadn't lived the way you have you would already be dead".
"If everybody was the same, Baskin Robbins would have only one kind of ice dream, and that's a world I don't want to live in." - Harry Anderson, IIRC.
If the argument is that different people are suited for different sports, or different sports are suited for different people, that goes almost without saying. Very few individuals turn down NBA contracts to become jockeys. At the elite level, even such seemingly similar sporting events as shot-put, discus, and javelin have subtly different body types.
Ian Thorpe and Michael Phelps, for instance, were both considered to by virtually perfect body types for swimming, tall, but with long torso and relatively short legs, broad shoulders, and big hands and feet.
Another guy named Dan
How many pf you are willing to explore the possibility that the genetics of "race", influences average cognitive ability in people of similar genetic background, i.e., race?