Classical yoga texts describe three primary bandhas, or internal locks: Mula Bandha at the pelvic floor, Uddiyana Bandha at the abdomen, and Jalandhara Bandha at the throat. When all three are engaged simultaneously, the combination is called Maha Bandha, sometimes counted as a fourth bandha in its own right. Modern yoga teaching has introduced a handful of additional “bandhas” for the hands and feet, though these have no basis in the traditional literature and function quite differently from the original three.
Where Bandhas Come From in Classical Texts
The three bandhas show up across the major Hatha Yoga manuals written roughly between the 14th and 17th centuries. A review of these classical sources found that Uddiyana Bandha, Mula Bandha, and Jalandhara Bandha each appear in the Hatha Yoga Pradipika, the Gheranda Samhita, the Shiva Samhita, and the Hatha Ratnavali, listed alongside mudras (seals or gestures) rather than in a separate category.1Aathiyoga Indian Journal of Ancient Medicine and Yoga. The Therapeutic Effect of Ten Classical Mudras in the Perspective of Selective Hatha Yogic Texts: A Review Study That overlap between mudra and bandha is worth noting: the traditional texts did not always draw a sharp line between a “lock” and a “seal.” Maha Bandha, for instance, is listed in those same texts as one of ten classical mudras, even though it is functionally the simultaneous engagement of all three bandhas. The modern yoga world tends to separate bandhas from mudras more cleanly than the original authors did.
Mula Bandha, the Root Lock
Mula Bandha targets the muscles of the pelvic floor. The primary muscle involved is the puboperinealis, the fibers connecting to the perineal body. Contracting and holding this area lifts the muscular plate higher in the pelvis, and over time strengthens the pelvic floor muscles enough to provide better structural support to the organs above them.2Journal of Ayurveda and Integrated Medical Sciences. Mula Bandha: A Comprehensive Review of its Physiological, and Therapeutic Effect If you have ever been told to “engage your pelvic floor” in a yoga class, that instruction is a simplified version of Mula Bandha.
In practice, finding the right muscles can be tricky. The contraction is subtle and internal, and beginners often end up squeezing the glutes or the outer hip muscles instead. A common teaching cue is to imagine stopping the flow of urine midstream, which activates roughly the right area, though the actual lock is meant to be held with more nuance than that analogy implies. The contraction should feel like a gentle lift inward and upward rather than a hard clench.
Uddiyana Bandha, the Abdominal Lock
Uddiyana Bandha involves drawing the abdomen inward and upward after a full exhale, creating a hollowing effect under the ribcage. The maneuver manipulates pressures inside the torso. Research on the closely related abdominal vacuum technique, which traces its origins directly to uddiyana bandha, has found a significant drop in colon pressure of roughly 25 to 35 mmHg as long as the breath is held.3ResearchGate. The Abdominal Vacuum Technique for Bodybuilding The lock activates the transverse abdominal muscles and increases tension through the deep core, which is one reason it has attracted attention as a form of core stability training. One paper made the case that uddiyana bandha and the related nauli kriya (a rolling, wave-like abdominal movement) function as effective core stability exercises because they require coordinated control of the muscles surrounding the lumbar spine.4Journal of Bodywork and Movement Therapies. Yoga techniques as a means of core stability training
Uddiyana Bandha is almost always performed on an empty exhale. You breathe out completely, then draw the belly in and up without taking another breath. Holding it for any length of time while the lungs are empty is what produces the pressure changes researchers have measured. It is one of the more dramatic-looking bandhas: when done fully, the abdomen sinks visibly below the ribcage.
Jalandhara Bandha, the Throat Lock
Jalandhara Bandha is performed by lowering the chin toward the chest and pressing it into the notch between the collarbones, while simultaneously lifting the sternum slightly to meet the chin. The effect is a firm seal at the throat that prevents air from escaping or entering during breath holds. It also compresses the carotid sinuses, the pressure-sensing areas in the neck that help regulate blood pressure and heart rate.
That compression produces measurable cardiovascular shifts. An experimental study found that during Jalandhara Bandha, heart rate, systolic blood pressure, and diastolic blood pressure all rose, resulting in a higher mean blood pressure. Heart rate variability analysis showed the sympathetic nervous system became more dominant while parasympathetic activity dropped.5Bharati Vidyapeeth Medical Journal. Immediate Effects of Bandha on Cardiovascular Autonomic Function: An Experimental Study In plain terms, performing the throat lock temporarily kicks your body into a more alert, activated state, likely because the compression at the carotid sinus triggers reflexes that the nervous system interprets as a signal to raise pressure.
Maha Bandha, the Great Lock
Maha Bandha is not a separate anatomical lock but the practice of engaging all three bandhas at the same time, usually during a breath hold after exhalation. You contract the pelvic floor (Mula Bandha), draw the abdomen in and up (Uddiyana Bandha), and tuck the chin to the chest (Jalandhara Bandha), all while the lungs are empty. Classical texts treat this as a distinct practice rather than simply a combination, and it is listed among the ten principal mudras of Hatha Yoga.1Aathiyoga Indian Journal of Ancient Medicine and Yoga. The Therapeutic Effect of Ten Classical Mudras in the Perspective of Selective Hatha Yogic Texts: A Review Study
Some yoga lineages count Maha Bandha as the fourth bandha, which is why you occasionally see references to “four bandhas” instead of three. Whether you count it separately is mostly a matter of convention. The important distinction is that it involves performing three known techniques together, not a fourth anatomical site.
How Bandhas Interact With Breath Retention
Bandhas are almost never practiced in isolation. They are designed to be used during pranayama, the controlled breathing practices of yoga, and specifically during kumbhaka, which is the intentional pause between an inhale and an exhale (or after an exhale). The locks serve a partly mechanical role: Jalandhara Bandha seals the airway at the throat, Uddiyana Bandha changes the pressure dynamics in the abdomen, and Mula Bandha anchors the base. Together they create a contained pressure system inside the torso during the breath hold.
The physiology of that breath hold is what drives many of the measurable effects. During kumbhaka, blood pressure rises, peripheral resistance increases, and the amount of blood the heart pumps per beat temporarily drops.6PubMed Central. Evaluation of Cardiovascular Functions during the Practice of Different Types of Yogic Breathing Techniques These changes reverse when the breath hold ends and breathing resumes. Whether the hold occurs after inhalation or after exhalation matters too. Research using brain blood-flow measurements found that holding the breath after inhaling increased sympathetic nervous system activity, while holding after exhaling increased parasympathetic activity, producing essentially opposite effects on blood flow in the brain’s arteries.7PubMed Central. Pranayamas and Their Neurophysiological Effects That distinction has practical implications: the type of kumbhaka you pair with your bandhas determines whether you are pushing your nervous system toward alertness or toward calm.
What Bandhas Do to the Autonomic Nervous System
The autonomic nervous system has two main branches: sympathetic (fight-or-flight) and parasympathetic (rest-and-digest). Bandha practice appears to influence both, though the direction of the influence depends on which bandha is being performed and for how long. As noted above, Jalandhara Bandha tends to push toward sympathetic dominance during the hold itself. Uddiyana Bandha is more complicated. A randomized crossover study in healthy volunteers found that during the actual practice of Uddiyana Bandha, both sympathetic and parasympathetic activity increased at the same time, and diastolic blood pressure rose temporarily but returned to normal within about ten minutes.8Journal of Bodywork and Movement Therapies. Immediate effects of Uddiyana bandha on blood pressure and heart rate variability in healthy individuals – a randomized crossover study The researchers described this co-activation as making it difficult to draw a simple conclusion about which branch “wins.”
The picture shifts in people with elevated blood pressure. A randomized controlled study in patients with hypertension found that Uddiyana Bandha practice immediately improved heart rate variability markers associated with parasympathetic activity. The high-frequency component of heart rate variability went up, while the ratio that indicates sympathetic dominance went down.9PubMed Central. Immediate Effect of Uddiyana Bandha on Heart Rate Variability in Patients with Hypertension: A Randomised Controlled Study In other words, for people whose nervous systems are already running hot, the abdominal lock seemed to cool things down. Whether this translates to lasting blood pressure benefits with regular practice is an open question, but the short-term autonomic shift is a promising direction.
Mula Bandha and Pelvic Floor Health
Of the three classical bandhas, Mula Bandha has accumulated the most clinical research, largely because pelvic floor training is a well-established area of physical therapy. Multiple randomized trials have tested Mula Bandha-based yoga therapy (sometimes called MYT in the literature) against control groups, with encouraging results.
A randomized controlled trial in healthy women found that 12 weeks of Mula Bandha yoga therapy significantly strengthened pelvic floor muscles compared to a control group, leading the researchers to recommend it as a preventive measure against pelvic floor dysfunction.10PubMed Central. Assessment of the effect of Mulabandha yoga therapy in healthy women, stigmatized for pelvic floor dysfunctions: A randomized controlled trial A separate trial specifically targeting women with urinary incontinence found that three months of MYT produced substantial improvements in both stress and urge incontinence scores, while the control group showed no significant change.11Yoga Mimamsa. Mulabandha yoga therapy and its utility in cases of urinary incontinence in females: A randomized clinical trial And a third trial looked at women with mild pelvic organ prolapse. Those who received Mula Bandha yoga therapy improved more than controls on pelvic floor symptom scores, with the largest gains in urinary symptoms specifically, though the overall difference between groups fell below what the researchers considered clinically meaningful for prolapse as a whole.12PubMed Central. Effect of Mula Bandha Yoga in Mild Grade Pelvic Organ Prolapse: A Randomized Controlled Trial
Taken together, the evidence points to Mula Bandha being a genuinely useful pelvic floor exercise, particularly for prevention and for urinary symptoms. It is not a replacement for surgical intervention in advanced prolapse, but for mild cases and general strengthening, the data supports what yoga teachers have claimed for a long time. The pelvic floor is skeletal muscle, and like any skeletal muscle, it responds to consistent, targeted training.
Bandhas Beyond the Classical Three
If you attend a contemporary vinyasa or alignment-based yoga class, you may hear references to Hasta Bandha (hand lock) and Pada Bandha (foot lock). These are modern pedagogical inventions, not features of any classical text. Hasta Bandha refers to pressing through the knuckles and fingertips during poses like downward dog or plank, distributing weight evenly across the hand to protect the wrists. Pada Bandha is the analogous concept for the feet: lifting the arches and spreading the toes to create a stable foundation in standing poses.
These are useful anatomical cues for safe alignment, but calling them “bandhas” is a stretch of the original meaning. The classical bandhas involve internal muscular contractions paired with breath retention and are designed to influence energy flow and pressure dynamics inside the body. Pressing your hands into the floor is a different category of action entirely. The terminology stuck in modern yoga because “engage your hand bandha” sounds more integrated into the tradition than “spread your fingers and press down,” but the classical lineage does not support the equivalence.
You may also encounter references to Jihva Bandha, a tongue lock where the tip of the tongue presses against the roof of the mouth just behind the upper front teeth. Some yoga traditions include this as a minor bandha used during meditation, and it appears in certain Kundalini Yoga practices. It does not show up in the major Hatha Yoga texts as a named bandha, though tongue positioning is mentioned in the context of Khechari Mudra, a more advanced practice involving the tongue.
When to Be Cautious
Because bandhas manipulate internal pressures and temporarily shift cardiovascular function, they are not appropriate for everyone in all circumstances. Uddiyana Bandha creates a strong negative pressure in the abdomen and should be avoided during pregnancy, with abdominal hernias, during active digestive inflammation, and by anyone recovering from abdominal surgery. Jalandhara Bandha compresses the neck and affects blood pressure reflexes, so people with uncontrolled hypertension, cervical spine problems, or a history of stroke should approach it with particular care. Even the cardiovascular research described earlier shows that these locks produce real, measurable spikes in blood pressure during practice, even if those spikes are temporary.
The general advice in the yoga therapy literature is to learn bandhas from an experienced teacher rather than from written descriptions alone. The internal nature of the contractions makes them easy to perform incorrectly. Straining or bearing down instead of lifting during Mula Bandha, for instance, increases downward pressure on the pelvic floor, which is the opposite of the intended effect. And holding Uddiyana Bandha for too long on an empty exhale can cause dizziness or fainting in people who are not conditioned for breath retention.
Bandhas in a Broader Therapeutic Framework
A newer area of research has begun looking at how the muscular contractions traditionally described as bandhas fit into broader models of how the body manages tension and autonomic regulation. One framework, called movement-informed breathwork, maps specific neuromuscular pathways that activate during these contractions and proposes that they influence autonomic state and interoceptive awareness through identifiable physical mechanisms rather than the energy-based explanations found in classical texts.13OBM Integrative and Complementary Medicine. Movement-informed Breathwork (MiB): Integrating Muscular Contractions with Slow Conscious Connected Breathing for Therapeutic Application In other words, researchers are trying to translate the traditional language of “prana” and “energy locks” into the language of muscles, pressures, and nerve signals. The translation is still in early stages, and the two frameworks do not map onto each other perfectly, but the direction suggests that bandhas will increasingly be studied as specific physiological maneuvers rather than as mysterious esoteric practices.
For practitioners, none of this changes how the locks are actually performed. Whether you think of Mula Bandha as “lifting apana vayu” or as “contracting the puboperinealis to raise the pelvic floor muscular plate,” the physical action is the same. What the research does offer is some confidence that these ancient techniques are not simply ritual gestures. They produce measurable changes in blood pressure, heart rate variability, pelvic floor strength, and intra-abdominal pressure. The three classical bandhas earned their central place in Hatha Yoga for reasons that modern physiology is only beginning to articulate clearly.