In the video, a young boy is seen flexing his arm muscles while a man plays the piano in the background. The boy is wearing a blue shirt and appears to be in a living room. The man is wearing a white shirt and is seated at a wooden piano. The boy's muscles are visibly tense as he flexes his arm, and the man continues to play the piano throughout the video. The room is well-lit, and there are no other people or objects visible in the video.