The aim of the research was to establish the influence of a six-month COMBO aerobics exercise on certain skin folds, body sizes, body mass indexes and shares of fat and muscle mass. The research included 40 women, aged from 20 to 55, who were divided into experimental (average age 41.85 9.30) and control (average age 42.05 9.79) group. To acquire all information we conducted measurements of 9 variables at the beginning and end of the six-month exercise period. The results have shown that COMBO aerobics had a positive effect on almost all measured variables, except waist skin fold. In addition to that we have also established a positive and statistically significant influence of the exercise on the body mass index (-3.7%) as well as on the share of fat (-1.6%) and muscle (+1.04%) mass.