Thunderbolt pose (virasana) can be particularly hard on the knees and ankles, so David shows you how you can sit comfortably using blankets and pillows, while still getting the most from the pose and maintaining the ability to move into other stretches. He also shows you how to make a bolster if you don't have one. This class is a part of a 'Yoga for Beginners' series, which you can find on our Yoga for Beginners page.