this post is more of an actual question than my usual articles. the race track must be set up on a smooth flat surface such as cement or pavement. it is what we call in the direct way: the source. to listening to sam's awesome brother ross absolutely blow the room away with his performance of the first dance. the little girl's grandmother also says the commentary on social media about the video is heartbreaking, as some of the comments focus on the girl's race. so glad you love these, too! 