INTENSIFYING PHYSICAL EDUCATION CLASSES THROUGH THE APPLICATION OF CONTEMPORARY AEROBICS PROGRAM Danijela Kuna1, Srna Jenko Miholić2 and Josipa Peršun3 1Faculty of Kinesiology, University of Split, Split, Croatia, 2Faculty of Teacher Education, University of Zagreb, Zagreb, Croatia, 3Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia