In the video, a man is seen assembling a bicycle. He starts by placing the front wheel onto the frame of the bicycle. The man then proceeds to attach the pedals to the frame. Once the pedals are secured, he moves on to the handlebars, which he attaches to the frame. Finally, he completes the assembly by attaching the rear wheel to the frame. The man's actions are deliberate and precise, indicating that he is experienced in assembling bicycles. The video provides a clear and detailed view of each step in the assembly process, making it easy for viewers to follow along.