Tennis is becoming an increasingly popular sport among spectatros, children and amateurs. It is an extremly complex sport because it requires fitness, mental and tehnical-tactical readiness. Tennis is primarly an anaerobic sport. The most dominant motor skills in tennis are SAQ abilities, i.e. speed, agility and quickness. All three properties are treated together due to similar components, however agility is one of the most important abilities both in tennis and in other sports. Agility is the ability to quickly and effectivly change direction. Agility is divided into media, way of preforming movement, way of changing direction, purpose of changing direction, and most important division, as a reaction to external stimulus. As a reaction to external stimulus, agiliy is divided into reactive and non-reactive. An essential step before putting together a training plan and program is testing our athletes. Agility testing is a difficult process because agility i salso influenced by other abilities such as coordination, speed, strength, reflexes. When training agility, it is important that the ability we develop coincides with the requirements and specifics of the sport itself and ranges from less complex exercises, gradually, to more demanding exercises. In tennis, good agility is manifeste din tennis playres who play very effective and efficient shots and have the ability to quickly adapt to difficult shots without visible effort. If we want to have ready and successful tennis players, work and development on agility together with other speed-explosive properties is inevitably.