In the video, a man is lying on his back on a green mat, with his head resting on a yellow ball. He is wearing a black shirt and black shorts. The man is performing sit-ups, lifting his upper body off the mat and then lowering it back down. The room has a large window with white curtains, and there is a large gray exercise ball in the background. The man's movements are controlled and steady, indicating that he is experienced with this exercise.