These fills are based on getting use to moving around the kit, with your hands. The fills on the left move clockwise around the kit and the fills on the right move counter clockwise, which is more unusual, except for fill 8, which uses both clockwise and counter clockwise motions. All the fills are supposed to be played using alternating single strokes. The fills on the left start with the right hand, and the fills on the right start using the left hand, except for fill 8, where you can use either right hand or left hand leads.