This lesson focuses on the foundational aspects of serving in tennis, emphasizing the importance of foot positioning, knee bend, and body balance. The coach demonstrates how to achieve a stable and powerful serve by incorporating proper foot movements and weight distribution. Players are encouraged to maintain their balance while preparing to serve, with a focus on forward motion and the correct placement of their body. The use of hip and shoulder alignment is also highlighted to ensure the ball trajectory is both accurate and difficult for opponents to anticipate.