Orban accepted a job offered by Wing CommanderJohn Tett and returned to Canada in 1956, despite offers of employment from several American universities. He took a position at the Department of National Defence and was tasked to develop a fitness programme for Royal Canadian Air Force pilots, a third of whom were not considered fit to fly. In response to this brief he created the 5BX plan for men and the XBX plan for women. The plans were innovative in two respects. Firstly, they did not require access to specialised equipment. Many Air Force pilots were located in remote bases in northern Canada, with no access to these facilities, so it was important to offer a means of keeping fit without their use. Secondly, the plans only required 11 minutes or 12 minutes per day to be spent on the exercises. While studying the effect of exercise at the University of Illinois in the 1950s, Orban noticed when testing oxygen intake that long periods of exercise did not necessarily lead to significant improvement. This led him to the conclusion that the intensity of exercise was more important, than the amount of time spent on it. This aspect of the plan drew a negative reaction from others in the field but the 5BX programme proved its worth. 23 million copies of the booklets were sold, being translated into 13 languages. The popularity of the programs in many countries around the world helped to launch modern fitness culture. Orban, as a public servant, received no additional income from the success of the plan. In 1958, the University of Saskatchewan employed Orban to take the position of dean at its new Physical Education programme. While there he initiated the Saskatchewan Growth Study - a pioneering study of physical development in boys aged 7 to 17. In 1966, Orban returned to Ottawa to become a professor of the University of Ottawa's Human Kinetics department and became dean of that department in 1968, a position he occupied until 1976. He continued as a professor in Kinanthropology until his retirement in 1987. After his retirement, Orban developed the Physical Energetics Systems of Equations. This would allow individuals to calculate exactly how fit they could potentially be and what level of exercise would allow them to achieve this. He hoped that it would allow training times for athletes to be cut and help people recovering from illnesses to become fitter.
