In clause features of influence of employment by step-aerobics and fitball-aerobics on a level of physical readiness of girls of 18-20 years are analyzed. The results received during the lead experimental research, have allowed ascertaining, that under influence of employment results have improved at girls of both groups. However, authentic improvement of parameters is observed at girls of group №1 in the tests describing development of speed-power qualities and force, and at girls of group №2 parameters of development of flexibility have authentically improved. The results fixed in other tests of girls of both groups, testify to the tendency to improvement of these parameters.