Technical proficiency in tennis is the research of the ideal shot on the basis of physical laws and biological systems. This pillar revolves around "Stroke Mechanics", which lays down the exact racket paths and contact points that must be used to regulate the ball's flight. Independent of this is the "Equipment and Physics" study that investigates how racket materials and string tension work with aerodymanic forces. Last but not least, Biomechanics and Movement help understand where the "human engine" gets the energy and how it makes that energy travel from the ground through the core in order to produce power.
These factors together constitute the mechanical basis that makes it possible for one to move across the entire court with accuracy and speed.