From Tadasana step your left foot back about four feet from your right foot, keeping your left foot in line with your left hip, as if your feet were in railroad tracks rather than a tight rope. The left heel should stretch to the floor with the toes turned out about 45 degrees. Your hips and chest should still being facing forward. Lift your arms over head shoulder width apart and release the sit bones downward (mindful not to sink into the curve of your lower back when you raise your arms). Grounding into the outer edge of your left foot, bend into your right knee. Keep your right knee and ankle in line with your right hip. Keep your left leg strong, straight and grounded.