In the video, a woman is seen sitting on a green yoga mat. She is wearing a purple tank top and black pants. The woman is demonstrating how to do a proper sit-up. She starts by lying on her back with her knees bent and hands behind her head. Then she lifts her upper body towards her knees while keeping her head and shoulders on the ground. She repeats this motion several times. The woman is speaking throughout the video, providing instructions on how to perform the exercise correctly.