While doing this lower your right knee to just about an inch off the ground (so that your right thigh is perpendicular to the ground). As in the picture below.

Now from this position thrust yourself upwards off the ground, and while in the air you change your stance by bringing your left leg backwards and putting your right leg forwards. You then land on this opposite stance, and then thrust yourself again off the ground switching legs once again and landing as you did at the beginning. Now that is one rep. The whole exercise is a continuous movement and you keep going until you have finished your specific amount of repetitions.

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You start standing normally in an upright position. You then basically run on the spot, bringing your knees as high as you can and alternating each knee. Once you have brought both knees up, that constitutes one rep. The whole exercise is a continuous movement and you keep going until you have finished your specific amount of repetitions.

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