Lie a drill ladder on the ground.
During this exercise both feet will go in the ladder, then both feet outside the ladder.
Start with two paces inside the ladder, then pace your feet either side of the ladder.
Repeat this movement, travelling forwards in each square.
Make sure you change your leading leg as you change direction.
Start off steady, picking your feet up off the floor quickly and landing on your toes.
Build the speed with each length.