Loose Cabboose

Class is divided up into groups of 4 with each group of 4 standing in single file holding waist onto the of the student in front. One group are nominated as the "Cabooses" and are free to run around the area on their own. On signal each caboose must try to grab the waist of an end of the line student. While this is happening each line of students moves around and tries to avoid the caboose from joining them. If a caboose is successful the student at the front of the line becomes the new caboose and attempts to join another line. At all times students must remain inside the playing area.

Make each caboose only able to join a specific line.