sentence: A large open outdoor area is shown by a moving camera. sentence:  A man wearing a helmet is shown riding a skateboard with a long wooden plan base in various outdoors locations. sentence:  A second rider joins the first rider on the skateboard. sentence:  A clip of a man not wearing a helmet and riding another skateboard is shown. sentence:  The helmeted man with the plank as a skateboard is shown again. sentence:  Several other individuals riding other skateboards are shown. sentence:  The original skateboarder is shown again.