There's a bit of naturalist fallacy there. Evolution optimizes for rates of success far below what we desire for comfortable living today. For instance, if 70%

There's a bit of naturalist fallacy there. Evolution optimizes for rates of success far below what we desire for comfortable living today. For instance, if 70% of humans were made for hunting and long distance running, that is an evolutionary success- we wouldn't go extinct and the trait, when inheritable may be selected for. But in modern life, if 1000 people take up long distance running, we cannot tolerate 300 suffering from debilitating injuries. Let's start with pre-running apes, assume ability to run results in k% rate of survival over inability to run and assuming these features are heritable, after N generations humans should all be organisms perfected for running. Both k and N should be high for all humans to be perfectly suited for running barefoot today without risk of injury. It will be nice to hear an expert on human evolution chime in here. The question also remains, can we extrapolate something that gave us evolutionary advantage to help us individually.