Humans from the dawn of their existence on this planet were designed to be athletes. Evading predators, hunting for food, war and migration are part of our DNA. Our bodies are machines designed to withstand the cruelty of mother nature and the challenges this planet has to offer. Despite what we have become (more lazy and overweight), all humans have the ability to train like athletes. So, to answer your question, yes. Not everyone needs to be trained at the same level as an elite athlete, but their training must be designed according to their fitness and health goals, so they can be more functional and efficient at what they do.