Outside the minor leagues are collegiate summer baseball leagues, which occupy towns even smaller than those at the lower end of minor league baseball and typically cannot support professional sports. Summer baseball is an amateur exercise and uses players that choose not to play for payment in order to remain eligible to play college baseball for their respective universities in the spring. At the absolute lowest end of the organized baseball system is senior amateur baseball (also known as Town Team Baseball), which typically plays its games only on weekends and uses rosters composed of local residents.