For many people, yoga begins and ends with the physical postures. But asana is only one limb of yoga. The larger yogic tradition includes breathwork, meditation, concentration, ethical practices, self-inquiry, and the cultivation of a steady mind.
Patanjali’s Yoga Sutras define yoga in one of the tradition’s most well-known verses:
“Yogaś citta-vṛtti-nirodhaḥ.”
Yoga is the stilling or restraint of the fluctuations of the mind. Yoga Sutra 1.2
The Bhagavad Gita offers another definition:
“Evenness of mind is called Yoga.”
In Chapter 2, verse 48, Krishna describes yoga as remaining even-minded in success and failure. Bhagavad Gita 2.48
Together, these teachings point toward something much broader than a physical workout. Yoga is a practice of transforming how we relate to the body, breath, mind, emotions, and ultimately our experience of life.
Modern research is now investigating many of these same dimensions. While different forms of yoga emphasize different practices, research suggests that a consistent practice can have meaningful effects on physical function, sleep, stress regulation, cognitive performance, and brain health.
Here are five of the most compelling benefits.
1. Hatha Yoga Supports Strength, Balance and Physical Function
Hatha yoga uses physical postures to develop more than mobility. Holding and transitioning between postures requires muscular engagement, postural control, coordination, and balance.
A 2019 systematic review and meta-analysis of 22 randomized controlled trials examined the effects of yoga on physical function and quality of life in older adults.
The researchers found that, compared with inactive controls, yoga significantly improved balance, lower-limb strength, and lower-body flexibility. Yoga also produced improvements in several measures of health-related quality of life. Importantly, lower-limb strength also improved when yoga was compared with active control groups.
These findings demonstrate why the physical practice of yoga can be valuable even when flexibility isn’t the goal. The combination of controlled movement, weight-bearing postures, balance challenges, and sustained muscular engagement can contribute to maintaining physical function.
Yoga therefore has the potential to be a lifelong movement practice—not simply something practiced for aesthetics or performance.
2. Hatha Yoga Can Improve Sleep Quality
Sleep is another area where a regular physical yoga practice may have measurable benefits.
A systematic review and meta-analysis examining yoga and sleep included 19 randomized controlled trials involving 1,832 women with sleep problems.
The researchers found a significant improvement in sleep quality among participants practicing yoga, with the combined analysis showing a statistically significant improvement in sleep outcomes.
The researchers concluded that yoga may be a useful complementary approach for improving sleep quality and reducing insomnia symptoms.
This makes sense when we consider what happens during a typical yoga practice. The practitioner moves the body, coordinates movement with breathing, directs attention inward, and eventually becomes still.
Rather than constantly stimulating the nervous system with more information, yoga creates periods in which the body and mind are asked to slow down.
Over time, that transition from activity to stillness may become an important part of a healthy evening routine and overall sleep practice.
3. Meditation Can Reduce the Body’s Response to Stress
One of the most important aspects of yoga is what happens when the body becomes still.
Meditation, breath awareness, and focused attention train us to observe our internal experience without immediately reacting to everything that arises.
Researchers have begun examining whether these practices can actually influence physiological stress responses.
A 2024 systematic review published in Stress and Health examined 28 randomized or crossover studies involving 2,574 participants and looked specifically at yoga, meditation, and breathing practices and acute stress reactivity.
Of the 28 studies, 21 reported outcomes favoring the intervention. Among studies measuring physiological stress responses, 71% found reduced stress reactivity, while 65% of studies measuring psychological outcomes found reductions.
Read the full study: Effect of a single session of yoga and meditation on stress reactivity — PubMed
This is particularly significant because stress isn’t purely psychological. It involves measurable physiological changes throughout the body.
Meditation gives us an opportunity to practice a different response: noticing thoughts, sensations, and emotions without automatically being driven by them.
In that sense, the scientific findings connect beautifully with Patanjali’s description of yoga as the stilling of the fluctuations of the mind.
4. Kundalini Yoga May Improve Executive Function and Resilience
Kundalini yoga incorporates physical movement alongside breathing techniques, meditation, mantra, concentration, and relaxation.
That combination makes it particularly interesting when studying cognitive and emotional health.
A randomized controlled trial published in International Psychogeriatrics studied 81 adults over the age of 55 with mild cognitive impairment.
Participants were assigned either to a 12-week Kundalini yoga program or to memory enhancement training.
Both groups showed improvements in memory. However, the Kundalini yoga group demonstrated significant improvements in executive functioning, while also showing improvements in depressive symptoms and resilience.
The improvements in executive functioning were maintained at the longer-term follow-up.
Executive function encompasses mental abilities involved in areas such as attention, planning, decision-making, cognitive flexibility, and regulating behavior.
This is one reason the broader components of Kundalini yoga are so interesting. The practice isn’t asking the mind to simply become passive. It frequently asks the practitioner to focus, coordinate breath and movement, repeat mantra, maintain attention, and observe internal experience.
These are forms of mental training as well as physical practice.
5. Kirtan Kriya May Support Memory and Healthy Brain Aging
Kirtan Kriya is a meditation practice traditionally associated with Kundalini yoga that combines mantra repetition with specific finger movements, or mudras.
The practice uses the sounds Saa, Taa, Naa, Maa while attention is coordinated with the movements of the fingers.
One particularly interesting study investigated Kirtan Kriya in adults experiencing subjective cognitive decline—a population considered to have an increased risk for future cognitive impairment.
In this pilot randomized controlled trial, 60 participants were assigned to either Kirtan Kriya meditation or music listening.
Participants practiced their assigned intervention for 12 minutes per day for three months.
Both groups demonstrated improvements in memory and cognitive performance, with benefits continuing during the follow-up period.
Research has also examined Kundalini yoga and Kirtan Kriya specifically in relation to brain structure.
In a randomized controlled trial involving older women with subjective cognitive decline and cardiovascular risk factors, researchers investigated whether a 12-week program of Kundalini yoga and Kirtan Kriya could affect gray matter volume.
The study found differences in brain regions associated with cognitive function, providing preliminary evidence that this type of practice may influence aspects of brain health.
The Alzheimer’s connection is especially interesting because cognitive decline is influenced by multiple factors, including cardiovascular health, stress, sleep, mood, and cognitive activity. Practices such as Kundalini yoga and Kirtan Kriya bring several of these elements together.
The research is still developing, but these findings suggest that a short, consistent meditation practice may have meaningful effects on memory and aspects of cognitive health.
Yoga Is a Practice for the Whole Human Being
Yoga has survived for thousands of years because it was never only about what the body could do.
The physical practice gives us a way to work with the body.
The breath gives us a way to influence our internal state.
Meditation gives us a way to train attention.
Mantra gives the mind an object of concentration.
And the deeper practice of yoga asks us to develop greater steadiness in how we approach life.
It is about developing the capacity to meet the body, the mind, and life itself with greater awareness.
That is the practice of yoga.
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