What is a you turn on the amazing race?

A "U-turn" on "The Amazing Race" is a game mechanic that allows one team to force another team to return to complete a previous task. When a team reaches a U-turn point, they can choose to U-turn another team by placing their picture on a board, which requires the chosen team to go back and finish the task they skipped. This strategy can significantly impact the race by hindering the progress of the targeted team. Teams must use this option wisely, as it can create alliances or rivalries among contestants.