Patanjali's yoga sutras

समानजयाज्ज्वलनम्
samāna-jayāj-jvalanam

samāna समान – one of five life-winds or vital airs, which has its seat in the cavity of the navel and is essential to digestion
jayāj जया – conquest, victory; triumph; used as a suffix in compound words meaning, one who has achieved a victory or has triumphed over
jvalanam ज्ज्वलनम् – fire

Samana is one of the vayus, or life forces of the body, first written about in the Yoga Upanishads. In these texts, specific breathing practices were prescribed to ensure “the fire in the stomach will burn well.” These techniques have been passed down through the generations, and it may be that they come to us just as Patanjali would have known them. To name just one kind of belly breathing done today, the Tibetan Buddhists’ tummo technique is famous for being able to heat the body so much that monks can sit comfortably in the snow as their rising temperature melts it around them. In the Ayurvedic tradition, health care practitioners also continue to recognize the ancient concept of samana vayu, still seeing it as the balancing energy behind digestion and metabolism even as they acknowledge how these processes are understood by modern science.