The subject of my diploma thesis was a design and complex solution of the selected part of the interior of the sports and wellness centre ”Y“ in Piešťany. The designed interior is directly linked to the pre-diploma project of the architecture of this sports and wellness centre, which I developed during the winter semester of the 2018/2019 school year within the subject of Studio III.The whole diploma thesis is divided into a text part and a drawing part. The drawing part contains some drawings from the pre-diploma thesis, which are followed by specific parts of the thesis. Sports and wellness center "Y" is located in a secluded part of Piešťany. At present, the area is slightly neglected, serving as a seasonal inflatable swimming pool. The location is close to the hockey stadium, tennis and beach volleyball courts, squash club, bowling centre, kayak centre Lodenica, Hotel Sorea and Hotel Máj. The area has a great potential for its location, size and connection to the surrounding civic amenities. By its functions, the object builds on the complementary features of surrounding objects. The aim of the project was to design a sports club to be a centre for active recreation, and also to offer visitors real relaxation in the quarter of the town off the centre, close to other sports centres and the natural environment of the spa town. The landcape where the building is located is separated from the promenade which is surrounded by greenery on both sides, even by the Dubová stream. The solved area is also defined as a place with a greater concentration of cyclists, what I have also taken into account in my proposal. The aim of architecture in my pre-diploma project was to create an engaging building that attracts people with its appearance. Atypical metal roof that covers the building comes from a climbing wall located on the eastern side of the building. The aim was to design a number of glazed areas so that not only architecture, but also activities in the gym, swimming pool or wellness area, would attract the people around. The architecture of the building respects the surrounding buildings, trying to fit into this complex complemented by urban greenery. The layout of the building is divided into two parts - a gym and a swimming pool with wellness. These units communicate with each other not only visually through the entrance hall, where they can be seen, they are also connected by a common dressing room. The aim was to achieve operation where the individual units do not cross and the individual functions are not disturbing for the others.The subject of the diploma thesis is the solution of selected interior of the sports and wellness centre, which consists of the entrance hall, the reception and the fresh bar and wellness centre located on two floors.