If you go to www.HEP.video and enter the Video # that appears at the bottom of each section you can see an example of the movement that is described.
Marching Band is a fairly demanding physical activity. Veiw THIS VIDEO for a study done in 1993 on the demands of Drum Corps on a student musician. Although we aren't as demanding physically as a Drum Corps, this does give you an idea of the demands of the sport.