This ladder is a classic! It works on knee stability in change of direction. - Use a ladder or set up cones or other markers to make one to work on proprioception; you can also do this without a ladder, practicing the steps for about 5y. - Maintain athletic position, striking with the balls of the feet and letting the arms flow with your movements. - Think "in in out" as you advance forward, placing two feet in the box and the outside foot out of the box.