Yoga Sutras of Patanjali
The yoga scholar Andrea Jain states that while pranayama in modern yoga as exercise consists of synchronising the breath with movements (between asanas), in ancient texts like the "Bhagavad Gita" and the "Yoga Sutras of Patanjali", pranayama meant "complete cessation of breathing", for which she cites Bronkhorst 2007. The "Yoga Sutras" state: