Yoga Stretching for Leg Flexibility Is an all-levels Vinyasa Flow class. Enjoy this class in the morning or anytime of day. If you do a lot of sitting for work or if you drive a lot, put this class in your regular rotation. Sitting causes the hip flexor muscles to shorten and many people experience the lower back over-arching (moving the pelvis into an anterior tilt) which causes lower back pain. Practice this yoga video regularly to relieve pain from sitting. Thanks to Jess Lancaster for requesting this class. Thank you for telling your friends about me!!! Spreading the word to people you know is the very best compliment.