Place the middle of the resistance band under the balls of your feet and stand with your heels off the edge of the step or ledge. Begin with your body erect and chest up creating a neutral spine. Raise your arms up to your sides with your hands at head height. Prevent your knees from locking out and raise your heels up as high as you can while balancing on the balls of your feet. Then proceed to drop your heels toward the floor slowly to a full dorsi-flexion position. Control your movement through the entire range of motion and repeat.