Hatha yoga
In Hatha yoga, "Bindu visarga" is said to be the source of Bindu fluid, which contains a nectar ("amrita") and a poison. Bindu is identified with the semen, and it is controlled by techniques such as Viparita Karani and Khechari Mudra. The fluid is released from the "Bindu visarga", and can be stored in the lalana chakra and purified in the Vishuddha chakra. When the Vishuddha is inactive the fluid flows to the manipura chakra, where it is consumed (leading to physical decline). According to the "Hatha Yoga Pradipika", a hatha yoga practitioner can prolong their life by controlling the flow of the fluid. Through practice of Khecari mudra, a practitioner can manipulate the flow of the fluid from the lalana to the Vishuddha (where it is purified to amrita).