Yoga (योग; ) is a group of physical, mental, and spiritual practices or disciplines which originated in ancient India. Yoga is one of the six orthodox schools of Hindu philosophical traditions. There is a broad variety of yoga schools, practices, and goals in Hinduism, Buddhism, and Jainism. The term "yoga" in the Western world often denotes a modern form of Hatha yoga, yoga as exercise, consisting largely of the postures called asanas. The origins of yoga have been speculated to date back to pre-Vedic Indian traditions; it is mentioned in the Rigveda, but most likely developed around the sixth and fifth centuries BCE, in ancient India's ascetic and śramaṇa movements. The chronology of earliest texts describing yoga-practices is unclear, varyingly credited to Upanishads. The Yoga Sutras of Patanjali date from the first half of the 1st millennium CE, and gained prominence in the West in the 20th century. Hatha yoga texts emerged sometimes between the 9th and 11th century with origins in tantra. Yoga gurus from India later introduced yoga to the West, following the success of Swami Vivekananda in the late 19th and early 20th century with his adaptation of yoga tradition, excluding asanas. Outside India, it has developed into a posture-based physical fitness, stress-relief and relaxation technique. Yoga in Indian traditions, however, is more than physical exercise; it has a meditative and spiritual core. One of the six major orthodox schools of Hinduism is also called Yoga, which has its own epistemology and metaphysics, and is closely related to Hindu Samkhya philosophy. The impact of postural yoga on physical and mental health has been a topic of systematic studies, with evidence that regular yoga practice yields benefits for low back pain and stress. On December 1, 2016, yoga was listed by UNESCO as an intangible cultural heritage.

Hinduism is an Indian religion and dharma, or way of life, widely practiced in the Indian subcontinent and parts of Southeast Asia. Hinduism has been called the oldest religion in the world, and some practitioners and scholars refer to it as Sanātana Dharma, "the eternal tradition", or the "eternal way", beyond human history. Scholars regard Hinduism as a fusion or synthesis of various Indian cultures, with diverse roots and no founder. This "Hindu synthesis" started to develop between 500 BCE and 300 CE, after the end of the Vedic period (1500 to 500 BCE), and flourished in the medieval period, with the decline of Buddhism in India. Although Hinduism contains a range of philosophies, it is linked by shared concepts, recognisable rituals, cosmology, shared textual resources, and pilgrimage to sacred sites. Hindu texts are classified into Śruti ("heard") and Smṛti ("remembered"). These texts discuss theology, philosophy, mythology, Vedic yajna, Yoga, agamic rituals, and temple building, among other topics. Major scriptures include the Vedas and the Upanishads, the Puranas, the Mahabharata, the Ramayana, and the Āgamas. Sources of authority and eternal truths in its texts play an important role, but there is also a strong Hindu tradition of questioning authority in order to deepen the understanding of these truths and to further develop the tradition. Prominent themes in Hindu beliefs include the four Puruṣārthas, the proper goals or aims of human life, namely Dharma (ethics/duties), Artha (prosperity/work), Kama (desires/passions) and Moksha (liberation/freedom from the cycle of death and rebirth/salvation); karma (action, intent and consequences), Saṃsāra (cycle of death and rebirth), and the various Yogas (paths or practices to attain moksha). Hinduism prescribes the eternal duties, such as honesty, refraining from injuring living beings (ahimsa), patience, forbearance, self-restraint, and compassion, among others. The four largest denominations of Hinduism are the Vaishnavism, Shaivism, Shaktism and Smartism. There are six āstika schools of Hindu philosophy, who recognise the authority of the Vedas, namely Sankhya, Yoga, Nyaya, Vaisheshika, Mimamsa and Vedanta. Hinduism is the world's third largest religion; its followers, known as Hindus, constitute about 1.15 billion, or 15–16% of the global population. Hinduism is the most widely professed faith in India, Nepal and Mauritius. It is also the predominant religion in Bali, Indonesia. Significant numbers of Hindu communities are also found in the Caribbean, Southeast Asia, North America, Europe, Oceania, Africa, and other regions.