Therapeutic classes
Here is a short video about ‘how Iyengar therapeutic yoga is been practised’ at the Ramamani Iyengar Yoga Memorial Institute in Pune, India (R.I.Y.M.I.)
How to practice Shoulder-stand
Salamba Sarvangasana (or shoulder-stand) is one of the most beneficial poses in Iyengar yoga. Amongst various positive effects, it helps to recover from fatigue, reset the glandular system and boost the immunity.
For best results – in this video, you can learn in details a proper practice of Salamba Sarvangasana
BKS Iyengar
On turning yoga as a disappointment into an appointment 
Worth a listen 