The National Cyber and Information Security Agency's activities include the development and organization of cyber exercises. Exercises play an irreplaceable role in ensuring cyber security in the Czech Republic. They enable to authentically simulate different types of crisis situations while engaging both technical experts as well as decision makers as training audience. Development, organization, and execution of exercises require close cooperation with other partners within the so-called whole-of-government approach. In addition to the educational element, exercises help to build trust and strengthen relationships.