Yoga Postures and Exercises for Thighs. Part of the series: Yoga Exercises. Utkatasana, also known as Chair Pose or Lightning Bolt, represents one of the classic yoga postures and exercises for strengthening and toning the thighs. Learn how to perform this pose yourself with the help of this free yoga video. Read more: http://www.ehow.com/video_7489696_yoga-postures-exercises-thighs.html