Contract; hold; tighten; or lock. Bandhas are a class of Hatha Yoga techniques that aim to lock prana in particular areas and redirect its flow into sushumna nadi. The bandhas assist us in the awakening, accumulation, and control of subtle energies for the purpose of spiritual transformation. They also induce a state of pratyahara (interiorization), which can ultimately help us go beyond duality. Bandhas involve the contraction of the muscles in specific areas of the body. There are three bandhas: mula bandha (the contraction of the muscles in the area of the perineum), uddiyana bandha (a contraction in the abdominal area), and jalandhara bandha (the locking of the throat).