This report provides a comprehensive analysis of web applications, focusing on the design, implementation, and testing of a website for RTT Gym. It begins by critically evaluating the functions and advantages of web applications, comparing client-side and server-side scripting languages, and examining web security concerns while offering recommendations for improvement. The report then delves into the design of a web application to meet the specific requirements of RTT Gym, detailing various web pages such as the homepage, services, and login page, and explaining both client-side and server-side functionalities. It also covers database design using SQL. The report concludes with a discussion of the implementation and testing phases, including references and illustrations to support the analysis. This report provides an in-depth understanding of web application development, covering key aspects from design to evaluation.