This drill is the prime exercise in specifically developing explosive leg and hip power for running, sprinting, and jumping.
Stand with one foot slightly ahead of the other as to initiate a step; arms should be relaxed and at the sides. Alternatively start by walking or running. 
Begin by pushing off with the back leg, driving the knee forward and upward to gain as much height and distance as possible before landing. Repeat the sequence (driving with the other leg) upon landing. Keep the ankle locked toes-up and the heel up under the hips. Either move arms like for running, or make a double arm swing.