My friend shared Esther Gokhale's work with me recently. She is teaching people in this video how to walk by looking at young children, ancient art, and people from non westernized cultures. Her work is well-researched and easy to try. I love her suggestions, because it feels like a more natural way to sit and walk. I have always not felt right about advise along the lines of 'sit up straight,' 'pull your shoulders back,' and 'tuck in your pelvis.' Esther explains why that doesn't work, and she shows you a better way. This video also helped me understand why I hate the bucket seats in sedans so much also.