Which sentence correctly uses a colon? A healthy exercise routine includes tried and true injury-prevention activities: warming up, stretching, and drinking plenty of water. Like many new students, her first activities included: registering for classes, becoming familiar with the campus, and attending a special orientation. This month’s edition of the teen magazine features: profiles of influential artists, fashion trends, and social issues that many of today’s youth care about. Before leaving the house, he had to make sure he had: the directions to the event, an extra set of clothes, and a book to read while he waited.