Often Running is a retail store that caters to individuals who enjoy running and walking. However, the store understands that not all individuals are the same, and many may share one or more characteristics that lead them to have similar product needs. For instance, runners participating in high school or college track teams may need several different types of shoes for training, including running shoes, indoor track shoes, and outdoor spike shoes. The group of runners who are members of a track team would represent a market _______ to the business.