Supplies: Long lengths of rope AND a predetermined course. Divide your group in teams of at least 5 or more. The larger the team size, the more difficult it is. Tie the rope around the entire team at waist level. Make the rope as snug as possible without hurting the students.
Put them on the obstacle course and turn them loose. Teams can be timed during their running of the course, or you can actually have a couple of teams race!
The key is to work together as a team to accomplish a common goal. NOTE: The course can be inside or outside, just make sure the course is safe & clearly defined.