This concept teaches players to visualise a hypothetical circle around them while moving, with the radius representing their comfortable hitting range. For younger players, the circle may be 2-3 meters, while for professionals, it can be 6-8 meters. Training focuses on expanding this circle by improving movement components like strength, stability, and mobility. The best movers excel at the end ranges of their circle, making it crucial for all players to consistently work on developing this skill, regardless of age or level.