Exactly, different influences on health by diet and activity (is exercise the right term?). If one is not fit, it makes it harder to obtain food for diet, whether it was a situation during the Paleo period or a current situation today that requires a certain level of good health to function most optimally in a job providing the means to acquire healthy food. The idea of being fit today lacks a clear definition, as many (I was one myself for years) tend to overdo fitness pursuits to achieve what is really a necessary baseline for a fully functioning human. Chronic cardio is not necessary for health or fitness.