Developing a tennis player's athletic base for movement efficiency involves mastering techniques to react swiftly and efficiently to opponents' shots. This includes utilising optimal joint angles to generate effective ground reaction forces and ensuring proper weight distribution for rapid first and second step movements. Training the athletic base is critical both on-court and off-court in the gym. It should begin at a young age and be conducted in reactive environments to enhance the player's ability to respond to the tennis ball's movements. Establishing a robust athletic base is essential for optimising performance and reacting effectively to oncoming stimuli.