Udāna-vāyu—bodily air which moves upwards and which is controlled by the breathing exercises of the aṣṭāṅga-yoga system.

Udana-vayu-bodily air which moves upwards and which is controlled by the breathing exercises of the astahga-yoga system.
 

Link to this page: https://prabhupadabooks.com/glossary/u/udana-vayu-bodily-air-which-moves-upwards-and-which-is-contr