This graduate thesis shows and talks about fitness training for special occupations for which the term tactical worker or tactical athlete is used. These professions require a certain physical fitness and special knowledge to perform operational tasks, namely the police, army, firefighters and special forces. When talking about special units, which can be military or police, the term special forces will be used, which refers to members of the Lučko Anti-Terrorist Unit. The main goal of this work is to analyze the work and tasks of the Lučko Anti-terrorist Unit, and to show what abilities a special officer must develop to carry out operational tasks. Through diagnostics of fitness readiness and standards of special forces in the world, it focuses on those values that are essential for long-term and continuous work. The importance of continuous training for injury prevention and long-term operation of special forces will be presented. The fitness training methodology develops key motor and functional abilities that are necessary for the successful performance of operational tasks. The fitness training of the special forces must be at a high level throughout the year. The competition for a special officer is a "combat" and an operational task, which can be at any time of the day or night in uncontrolled conditions. This paper will show which periodization models are appropriate and most suitable for the needs of professionals.