Yoga Styles

Premodern haṭhayoga and the modern postural turn

A 2024 study of modern yoga and meditation describes modern postural yoga as established in the early twentieth century and as differing from traditional yoga, and describes haṭhayoga in earlier texts as working on the body to activate energy. The Haṭhapradīpikā, a foundational haṭhayoga text, is dated by a SOAS research project to the early fifteenth century, with the oldest manuscript used in its critical edition dated 1496 CE. This page does not repeat the general history of yoga.

Physical culture and the Mysore period

Mark Singleton's 2010 monograph Yoga Body is described in a library catalogue record as tracing how contemporary practice developed through Indian and Western physical culture, with a chapter on T. Krishnamacharya and the Mysore asana revival. The catalogue entry is a description only, and the book itself was not read for this draft.

A Wellcome Collection article states that Krishnamacharya (1888 to 1989) is called the father of modern yoga because his students B.K.S. Iyengar, Pattabhi Jois and Indra Devi made postural yoga influential internationally. It reports that the Maharajah of Mysore challenged him to make yoga competitive with bodybuilding, which led to demonstrations, films and university classes, and that scholars see similarities between his flowing vinyasa style and gymnastic systems such as Bukh's Fundamental Gymnastics.

Divergence from one teacher

The same article states that two of those students took different paths. Jois created ashtanga yoga, with counted breaths and linked sequences suited to group practice, while Iyengar emphasised precise, longer-held poses developed from his own training. The two systems are therefore related by lineage but differ in pace and method.

Other styles and their stated origins

A Sivananda organisation page attributes the five points of yoga (exercise, breathing, relaxation, diet, and positive thinking with meditation) to Swami Vishnudevananda's synthesis of Swami Sivananda's teaching; it gives no date. A World Religion and Spirituality Project entry places the origin of the heated, fixed 26-posture Bikram sequence around 1970 in Japan, with a studio opened in Beverly Hills in 1974.

A yin yoga community page describes two lineages: Paulie Zink's practice developed from martial arts, and a later form shaped by Paul Grilley and Sarah Powers around 2000, with Powers coining the name. A restorative yoga training page states that Iyengar developed a prop-based method and that his student Judith Lasater expanded it. These are the organisations' own accounts and were not checked against independent scholarship.

A label for many schools, not a formal classification

Yoga styles is used on this page for named schools and formats of mainly postural yoga; no formal classification of them was found. A systematic review of 306 randomised trials counted 52 different yoga styles, the most frequent being hatha yoga (36 trials), Iyengar yoga (31), pranayama (26) and the integrated approach to yoga therapy (15). The count shows how many labels trialists use, not that the labels are mutually exclusive categories.

The US National Center for Complementary and Integrative Health (NCCIH) says that there are many yoga styles, ranging from gentle practices to physically demanding ones, and that this variation affects how research can be interpreted. Reviews apply labels differently: one in people with cognitive impairment recorded Kundalini yoga (four studies), chair yoga (four) and hatha yoga (two), and another grouped yoga nidra and pranayama as meditative yoga.

Overlapping and brand names

Hatha is both a historical term for a body-focused yoga and a general class label. In the Cochrane review of yoga for low back pain, most trials used Iyengar, hatha or viniyoga forms. Vinyasa refers to the flowing linkage of poses described in the Mysore period, and the sources reviewed do not define vinyasa flow as a single standard format.

A 2025 systematic review defines hot yoga as any form of yoga undertaken in warm to hot ambient conditions of 25 degrees Celsius or above. Bikram is one specific heated method within that broader term, and 74% of the hot yoga studies in the review used it. Trauma-informed yoga and workplace yoga are named by population or setting, not by lineage.

Classical Indian sources describe several paths of yoga: an editorial on the Bhagavad Gita presents the paths of knowledge (Jnana), selfless action (Karma), meditation (Raja) and devotion (Bhakti), and a second review lists the same four. Haṭhayoga is described in later texts such as the Haṭhapradīpikā, dated to the early fifteenth century. Scholars describe modern postural yoga as established in the early twentieth century and as differing from traditional yoga; Krishnamacharya's Mysore teaching blended yoga with gymnastics and physical culture, and one author notes that most poses in modern classes have no antecedents beyond about 150 years.

What the styles have in common

NCCIH states that yoga as practised in the United States typically emphasises physical postures (asanas), breathing techniques (pranayama) and meditation. Within that shared frame, the styles are distinguished mainly by pace, how long poses are held, whether props or heat are used, and how much philosophy or relaxation is taught.

Where formats differ

Ashtanga uses counted breaths and linked, set sequences, while Iyengar uses precisely held poses. The Bikram method is described as a 90-minute class with two breathing exercises and the same 26 postures in the same order, in a room kept at roughly 90 to 105 degrees Fahrenheit. Across 43 hot yoga studies, sessions lasted 20 to 90 minutes at 30 to 52 degrees Celsius and 20 to 60% relative humidity.

The yin yoga page describes roughly 15 to 25 simple, mostly seated poses held for longer periods, while a restorative training page describes blankets, bolsters and blocks used so that the body can be supported. Sivananda classes are organised around five points, and workplace programmes bring yoga to employees at work. Formats vary between teachers and schools, and these descriptions come from the organisations concerned.

Uses described for yoga as a whole

NCCIH lists low back pain, neck pain, headaches and knee osteoarthritis as conditions for which yoga has been studied, and notes that study quality varies. A Sivananda organisation page presents its five points as supporting physical health, mental wellbeing and spiritual development. These are organisational statements and studied outcomes, and they should not be read as findings for every style.

Style and setting specific claims

A restorative training page says the practice activates the parasympathetic nervous system, lowers heart rate and blood pressure and supports immunity; these are practitioner claims and were not tested in the sources reviewed here. The hot yoga review states that claims of greater benefit than other forms of yoga or traditional exercise are, at present, unsubstantiated.

Workplace yoga has been studied mainly for stress and mental health outcomes among employees, and trauma-informed yoga has been studied for people who have experienced violence or trauma. The sources reviewed do not document why people choose one style over another in everyday life.

Family-level findings and what they do not show

A systematic review of 306 randomised trials of yoga (searched to February 2014) found that 91% reached positive conclusions and that the proportion did not differ between yoga styles. Its authors suggested that choice of style can rest on preference and availability. The measure is the trial authors' stated conclusion, not effect size or a head-to-head comparison, so it does not show that styles are equivalent for any particular outcome.

Overviews of reviews show the same caution. One overview of yoga for post-traumatic stress symptoms covered 11 systematic reviews and 59 trials (4,434 participants); seven meta-analyses found small to moderate effects and one did not, but most reviews were rated at critically low quality, and its authors called for standardising the type, duration and frequency of yoga.

Condition, population and style specific examples

A 2022 Cochrane review of 21 trials (2,223 adults) in chronic low back pain, mostly using Iyengar, hatha or viniyoga, found low to moderate certainty evidence of small, clinically unimportant improvements in function and pain against no exercise at three months, and little or no difference in back function against back-focused exercise. No trial used sham yoga, and all were unblinded. A 2019 review of 13 workplace trials reported benefits mainly for stress, no consistent change in most cardiovascular outcomes, and unclear risk of bias in nine trials.

A 2025 scoping review of 18 studies of trauma-informed yoga in survivors of sexual, domestic and interpersonal violence mapped self-reported improvements but did not pool effect sizes. A 2025 review of six trials in women with gynaecological cancers grouped yoga nidra and pranayama as meditative yoga, with moderate certainty for reduced depression, and reported higher adherence to restorative yoga than to vigorous forms. These results should not be carried to other styles or populations.

Hot yoga

A 2025 systematic review of 43 studies (942 participants, 76% female) found that a single hot session raised body temperature and heart rate without raising energy demand compared with unheated yoga. Chronic practice appeared to produce cardiometabolic and functional adaptations without harming kidney function or sleep in the groups studied. Psychological findings were promising but inconclusive, and many studies lacked rigorous designs.

Injury and adverse-event literature

A systematic review of nine observational studies (9,129 practitioners and 9,903 non-practitioners) reported adverse events in 22.7% of people during a class, a 12-month prevalence of 4.6% and serious events in 1.9%. The most common were musculoskeletal sprains and strains. Fall risk was comparable to non-practitioners, and meniscus injury was more likely (odds ratio 1.72). The authors judged most events mild and transient.

A review of 94 randomised trials that reported adverse events (8,430 participants) found no difference from usual care or exercise, but more events than with psychological or educational comparators, and called for better reporting. In the low back pain review, adverse events, mainly increased back pain, were more frequent than with no exercise and similar to other exercise.

Case reports, supervision and heat

A review of 76 published case reports linked headstand, shoulder stand, lotus position and forceful breathing to adverse events, mostly musculoskeletal (27 cases), with nervous system (14) and eye (9) events next. Its authors state that case reports cannot estimate frequency. NCCIH says most injuries are sprains and strains, that unsupervised self-teaching has been linked with higher risk, that hot yoga carries risks of overheating and dehydration, and that pregnant people should avoid it. No source reviewed compared injury rates between named styles.

Training, regulation and care boundaries

Yoga Alliance publishes standards for a registered yoga teacher credential, including a 200-hour training registered with the organisation, and members adopt its ethical commitment. No statutory regulation or national training standard for yoga teachers was found in the sources reviewed, and these do not cover individual countries. NCCIH advises asking about an instructor's training and experience.

The authors of the 2017 epidemiological review advise that people with serious acute or chronic illness seek medical advice before practising. Yoga should not delay assessment or replace necessary treatment.