In order to obtain maximum benefit from this essential asana make sure your stance is generously wide and bring your head all the way down to ground between your feet. Use a block under your head if necessary because bringing the head onto something distributes your weight more even throughout the body and increases the stability of your foundation by offering you an extra point of contact with ground. Continue to align your hips, knees, and feet in one continuous vertical line and as you stay in position, focus on hollowing the belly with each exhalation and releasing your spine from the pelvis downwards through the head. For position C if your shoulders are less mobile you can increase the shoulder work by catching a tie between your hands rather than clasping your fingers.