In the 21st century, Yoga has strayed far from its past, and purists argue the practice has become to user friendly over time. Critics also argue that the current emphasis on personal image and branding detracts from Yoga's mission as a spiritual discipline.
Patanjali's Yoga Sutras have been translated from the original Sanskrit Devanagari Script, to English, many times - and in many ways. The Yoga Sutras, themselves, are precisely organized in padas. The best cross-reference to the term "pada" is chapter. Below is a brief overview of the four chapters of Patanjali's Yoga Sutras.