The Lateral lunge emphasizes Hip/knee and inner-outer thigh strength. Start by standing straight, and take a large step to the side with one leg. Bend that knee and lunge to that side. Go as deep into the lunge as you are comfortable going but pay close attention to how your knees feel.Don't hold the position, lunge and then push back to your "home base". The size step you take and the depth of your lunge will be dependent upon your body's tolerance of the exercise. If you feel pain in the knees, BACK OFF! Don't reach so far or lunge so deep.