woman doing an exercise on a mat with a large exercise ball

woman doing an exercise on a mat with a large exercise ball. She is lying on her stomach on the mat, with the ball held between her feet and ankles, and her arms are extended out to the sides. The floor is black rubber. There are large, geometrically-shaped windows behind her, with a view of the ocean and blue sky. Another person and exercise equipment are visible further in the background. The video appears to be taken in a gym or exercise room on a cruise ship.