When interacting with interactive systems, users provide an input to the system and receive the corresponding output. On this cycle, there are translations between the components of the interactive process. But when using Web applications, translations can be affected due to the unique characteristics of the Web. Nowadays, and with the emergence of new interaction devices such as Microsoft Kinect which allows user movement to be captured, new approaches have appeared which facilitate the rehabilitation process. Web applications could be used on this process, for example, for designing postures or exercises. The creation of the postures may be complicated, involving a wide number of actions. If the physiotherapist does not feel comfortable using the rehabilitation system, it becomes cumbersome and hard to use. In this work we analyze how the interaction process of editing exercises in a virtual rehabilitation environment is affected when using Web applications. We propose the use local storage in a virtual rehabilitation environment based on the web to measure how it improves the interaction cycle and ultimately user usability and satisfaction.