Practice the Glide or Roll Step for a Marching Band
Start at a position of attention, or "set" position.
Shift to a "check" position, in which the heel of one foot is lifted off the ground up to the ankle of the opposite foot, bending the knee slightly and keeping the weight on the balls of the feet.
Extend the raised leg forward, straightening it so that the heel of the forward leg touches the ground and the toe is pointed straight up. As you do this, shift your weight almost entirely to the ball of the stationary back leg.
"Roll" the forward foot to the ground, from heel to toe. As you do this, shift your weight from the ball of your stationary foot to the ball of your front foot.
Bend the back leg slightly after your weight has been shifted, bringing it forward into the next "check" position.
Repeat the process with the other leg, keeping your upper body and hips as still as possible as you "glide" forward.
Practice until your step is a consistent 22.5 inches or 30 inches, whichever measurement your band uses.