By training and practicing Functional Fitness you improve your fitness on all fronts, so that you can also perform all or as many common movements as possible and complete tasks. The more tasks you can successfully complete, the fitter you are.
According to Functional Fitness, a person is most fit when all of his or her physical skills are most balanced. Thus, triathletes or marathoners can be considered fit, but are by no means less fit than Olympic weightlifters and gymnasts. In fact, Olympic weightlifters and gymnasts will most likely master more physical skills. For example, runners will score well in terms of endurance and stamina, but when it comes to strength, flexibility and power they often score well below average.