Sideline cheerleading is a sport where people cheer at a sports event (Football, basketball, etc.). Sideline cheerleaders put on halftime shows for the people watching when they are doing sideline. Cheerleaders don't just cheer when they are on the sidelines. They also tumble, stunt, and dance! They always dazzle the crowd when they do their performances.
Girl 1: Woah look, they're doing sideline cheerleading!
Girl 2: That's so cool!