1. Sri Tirumalai Krishnamacharya
“When recommending a yoga practice, teachers should always consider the individual circumstances of the student. Just as other activities have to be adapted to changes in life, such as aging, so must the yoga practice be adapted."
Sri T Krishnamacharya's Commentary on Yoga Sūtra I verse 34
Sri Krishnamacharya lived as a scholar, yoga teacher and Ayurveda healer in Madras (now Chennai) in the 20th century (1888-1989). He is considered to be the founder of modern Hatha Yoga. Typically, he did not separate physical exercises (Āsanas) and breathing techniques (Prānayāma) from one another., but combined them in a breath-centered approach. This practice allows the movements to slow down, being at the same time more invigorating and helps the mind to be more focused. Hence, the āsana practice itself becomes meditation. From practicing in motion to practicing in silence, it is then only a small step. Although I have never met this master personally, my practice is deeply inspired by his teachings.