A ground loop is driving around in a circle although you didn't intend to do so. This maneuver may be executed either on takeoff or landing. The maneuver may be terminated by striking a fixed object hereafter known as a crash or by reducing power and trying again (takeoff version). Most ground loops are followed by laughter from all witnesses and ribbing from the peanut gallery for about 1 hour (minimum). As long as no damage is done, all will eventually be OK. This is actually a common maneuver but it is awarded no points in any competition that I know of and does not appear in the Aresti system.