Convergence is a warm up that focuses on listening, support, taking risks and getting a group in synch. The goal is to get two players to simultaneously say the same word without preparation. When it happens it is magical, however it can take a long time to happen.
This is an extreme listening exercise. The two players are expected to speak and the same time and literally talk over each other. While talking over is a habit to be avoided in improv comedy it is encouraged in this exercise. The simplest form Double Opening the two players will simultaneously yell out nouns at each other. It is very challenging to hear what the other player has said.
One volunteer is designated air traffic controller and the other is designated the airplane. The airplane is instructed to close her eyes. The players milling about now become the terrain between the air traffic controller and the airplane. The terrain should be passable. Players can clump together to make terrain that make require the plane to crawl under. The air traffic controller guides the slowly moving airplane (player with her eyes closed) by giving verbal commands. An improvised radio voice is a nice touch