The sport featuring positions such as lock, flanker, and scrum-half is rugby. In rugby, these positions are crucial for both offense and defense, playing specific roles during play. The lock is responsible for winning lineouts and providing power in scrums, while flankers are key in breaking down play and supporting the backs. The scrum-half acts as a playmaker, distributing the ball from the base of scrums and rucks. Rugby is known for its teamwork, strategy, and intense physicality.