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 possess a larger inner range due to their movement capacity, making it more difficult for opponents to expose their end range.