Fitness (abbreviation of the English expression physical fitness), also called fitness gymnastics [1] or physical training [2], refers to a set of physical activities that allow the practitioner to improve his or her physical activity. fitness and lifestyle, for the sake of well-being. These activities may be: cardiovascular training [1] (cardio training, "cardiovascular exercises"), which includes endurance activities practiced indoors using ergometer simulators, such as the cyclo ergometer (exercise bike), treadmill, elliptical, treadmill, stair simulator, flexstrider, rower, etc. ; rhythmic gymnastics, or aerobics, which revolves around collective classes in choreographed music (step ...) or muscle building based on light weights (physical culture ...) or without load ("buttocks buttocks" ...). Due to the use of massive weights, bodybuilding is not considered fitness [3].