The Sickness-Wellness-Fitness Continuum & COVID-19. We dive into a 2002 CrossFit Journal article entitled, "What is Fitness?". Four standards for evaluating fitness are defined. We discuss the 4th standard, called the "Sickness-Wellness-Fitness Continuum". We explain what this is, what it means, how to pursue it and why it is critical during a crisis like COVID-19.