Summer camps can be found that offer intensive instruction in almost any sport imaginable, or that offer quality instruction and competition in a wide range of sports. Camps are split into groups of day camps and overnight camps. In the United States, overnight sports camps fall into two groups. The more traditional of these offer boys and girls the chance to learn and play many sports. Sessions are typically 3 to 8 weeks long, and some camps have multiple sessions. While many strong athletes attend these camps, a traditional sports camp program also serves the needs of less proficient athletes by having all campers compete on teams picked by ability, so all kids get a chance to contribute to their team's success in their daily competitions. Some of these camps have been operating for more than 100 years. These camps generally focus, through the medium of team sports, on the development of the whole child; not just how they are as an athlete, but also how they are as a person, a bunkmate, a teammate, and a friend. Many of these camps include a variety of non-sports programs as well for a more diverse experience.