Jalandhara Bandha or the Chin Lock is one of the three main Bandhas or locks practised by yogis. Jalandhara Bandha is described in the yogic texts Hatha Yoga Pradeepika, Gheranda Samhita and the Siva Samhita. Jalandhara Bandha is said to activate the Vishuddhi Chakra.
Mula Bandha or the Root Lock is one of the three main Bandhas or yogic locks practiced by yogis. Mula in Sanskrit means ‘root’ or ‘base’ and Bandha means a lock.
Bandha or a yogic lock enables a yogi to block and direct the flow of pranic energy in certain way to change the energy pattern in the body. Bandhas not only modifies the flow of pranic energy through the nadis (energy meridians), but also modifies the flow of nerve currents in the nervous system and blood flow through the blood vessels.