This master thesis deals with the development of the web application to support athletes and their training management. The application will be useful both for athletes and their trainings evidence and indicators calculation and for the couches and the trainings planning. The evaluation of the existing tools for the training management and evidence is made as a part of the thesis. Based on this, the consultations with the athletic couches, athletes and the author's experience, the functionality requirements are determined. The use cases of all the potencial users and the class diagram of the application are defined following the requirements. Latest web technologies such as Grails and Groovy were used during the application programming. The...