The video shows a woman lying on her back on a blue yoga mat. She is wearing a pink sports bra and black leggings. The woman is demonstrating how to do a proper sit-up. She starts by placing her hands behind her head and then lifts her upper body off the mat, keeping her legs straight. She then brings her knees towards her chest and touches them with her elbows. The woman repeats this motion several times, showing the correct way to do a sit-up.