Band members also try to keep a constant pace or step size while marching in parade. Step sizes usually vary between 22 and 30 inches (56–76 cm) per stride. A step size of 22.5 inches is called an "8-to-5" step because the marcher covers five yards (about 4.6 m) in eight steps. A step size of 30 inches is called "6-to-5" because five yards are covered in six steps. Because yard lines on an American football field are five yards apart, exact 8-to-5 and 6-to-5 steps are most useful for field shows.