Nauli is a yogic abdominal exercise in which you isolate and churn your core muscles in a rolling, wave-like motion. It looks striking when performed: the central strip of abdominal muscle visibly protrudes and rotates beneath the skin. Classified as one of the six traditional purification techniques (shatkarma) in hatha yoga, nauli has been practiced for centuries as a way to massage the internal organs and stimulate digestion.
How Nauli Works Anatomically
The technique centers on voluntary control of the rectus abdominis, the paired vertical muscles that run down the front of your abdomen (the “six-pack” muscles). During nauli, you create a vacuum in the abdominal cavity by exhaling fully and drawing the belly inward toward the spine. From that hollowed-out position, you then push your hands into your thighs with straight arms, which creates suction on the sides and forces the rectus abdominis to pop forward as a distinct vertical ridge.
Once you can isolate that central column of muscle, nauli has three variations. Madhyama nauli holds the contraction in the center. Vama nauli shifts the contraction to the left side. Dakshina nauli shifts it to the right. When you move smoothly between left, center, and right, the muscles appear to roll or churn across the abdomen, producing the wave-like motion the practice is known for.
Its Place in Yoga Tradition
Nauli belongs to a group of six cleansing practices described in classical hatha yoga texts like the Hatha Yoga Pradipika and the Gheranda Samhita. The other five are internal cleansing (dhauti), yogic enema (basti), nasal cleansing (neti), focused gazing (trataka), and a rapid breathing technique for the sinuses (kapalabhati). Together, these practices aim to balance what traditional Ayurvedic medicine calls the three humors: mucus, bile, and wind.
The Hatha Yoga Pradipika calls nauli “the crown of hatha practices,” crediting it with kindling a weak digestive fire, restoring digestion, and drying up “all defects and diseases.” While that language reflects a pre-modern framework, the underlying idea is straightforward: vigorously working the abdominal muscles stimulates the organs behind them.
What Nauli Does to Your Body
The churning action creates rhythmic changes in pressure inside the abdominal cavity. When you pull the abdomen inward and then roll the muscles, the stomach, intestines, liver, spleen, kidneys, and pancreas all receive a form of mechanical massage. This pressure cycling is thought to increase blood flow to the digestive organs and accelerate the secretion of gastric juices, which can improve how efficiently you break down and absorb food.
People who practice nauli regularly often report relief from bloating, sluggish digestion, and constipation. The mechanism makes intuitive sense: the physical compression and release of the intestines mimics the squeezing action that moves food through your gut. Research on the related abdominal lock technique (uddiyana bandha, which is the foundation of nauli) has shown that engaging it decreases both the volume and hydrostatic pressure in the large intestine, essentially compressing and then releasing the bowel.
There may also be a calming effect on the nervous system. The deep exhalation and breath-holding involved in nauli share characteristics with vagal maneuvers, physical actions that stimulate the vagus nerve. Extending, slowing, and holding the breath while flexing the abdominal muscles have all been shown to activate the parasympathetic nervous system and slow heart rate. This likely explains why many practitioners describe feeling calm and focused after the practice, not just physically stimulated.
Learning the Prerequisite: Uddiyana Bandha
You cannot perform nauli without first learning uddiyana bandha, the abdominal lock that creates the hollowed-out starting position. In uddiyana bandha, you exhale completely, then draw the entire abdominal wall inward and upward toward the spine without taking another breath. This creates a visible concavity below the ribcage. The lock is recognized as a core stability exercise that activates deep abdominal musculature, and it’s the platform from which all nauli variations launch.
Most yoga teachers recommend spending weeks or even months becoming comfortable with uddiyana bandha before attempting to isolate the rectus abdominis. Rushing into nauli without adequate abdominal control typically produces frustration rather than results, because the muscle isolation requires a level of neuromuscular awareness that takes time to develop.
Practical Guidelines for Practice
Nauli should always be performed on an empty stomach. Early morning before breakfast is the ideal time. If you’ve eaten, wait at least four to five hours before practicing. Performing nauli on a full stomach can cause nausea and discomfort, and the abdominal vacuum simply won’t work as well when the digestive system is processing food.
The basic standing position involves placing your feet slightly wider than hip-width apart, bending your knees, and resting your hands firmly on your thighs. From here, you exhale fully, engage uddiyana bandha, and then use the pressure of your hands against your legs to help isolate the rectus abdominis. Beginners typically start with just the central contraction (madhyama nauli), holding it for a few seconds at a time, and gradually work toward left-right rolling as control improves.
Nauli is not recommended during pregnancy, for people with hernias, or for anyone with active abdominal inflammation or ulcers. High blood pressure and recent abdominal surgery are also reasons to avoid the practice. The intense changes in intra-abdominal pressure that make nauli effective are the same reason it can be harmful under these conditions.
Why It Looks So Unusual
Videos of nauli often go viral because the rolling abdominal motion looks almost impossible, like something alien is moving beneath the skin. But the underlying action is simply muscle isolation, the same principle behind moving one eyebrow independently or wiggling your ears. The rectus abdominis is a voluntary muscle, and with enough practice, most people can learn to contract it in sections. What makes nauli visually dramatic is that few people in daily life ever develop this degree of isolated abdominal control, so the movement looks supernatural even though it’s purely muscular.
The learning curve varies widely. Some people achieve a basic central contraction within a few weeks of consistent practice. The full rolling motion, smoothly cycling from left to center to right and back, can take months of daily work. Patience with the process is part of the practice itself.