The four classifications of bandhas (energetic locks or seals) are mula bandha, uddiyana bandha, jalandhara bandha and maha bandha. Some yogis classify locks into three types and describe the maha bandha as a practice that involves the first three locks.
The location of the root lock is at the root chakra, which is at the base of the spine. The root lock promotes the flow of energy to the rectum. It redirects sexual energy to creative energy. This lock may also eliminate illness and promote vital energy. Regular practice of the root lock awakens kundalini power.