The modern lines in the world of movements' improving are accompanied by the occurrence of new terms and concepts in the area of that socio-cultural phenomenon. One of such concepts is "fitness", which has the wide circulation in the last decade, meets in names of clubs, improving programs and so on. Thus it has the most various interpretations and the application of it conducting to terminological and methodical mess. On the special-purpose designation "fitness" in the greater degree corresponds the standard in the Russia concept "physical culture". However this wide concept appreciably is declarative. The conceptual base of "fitness" has more concrete contents and it is the important making philosophy of success, which assumes the necessity of the certain level of preparedness to overcome the vital difficulties (physical, psychological, emotional). Thus "fitness" is the multivariate concept, including the wider spectrum of attributes, rather than the level of the physical condition only.