Successful people make an effort to keep their minds strong, their skills fresh, their bodies durable, and their sights focused on their goals. They are proactive and always on a path of discovering solutions to problems. They build and maintain resilience, always developing themselves while still being of service to others.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.