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Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions. Other forms of nuclear matter are also studied. Nuclear physics should not be confused with atomic physics, which studies the atom as a whole, including its electrons. Discoveries in nuclear physics have led to applications in many fields. This includes nuclear power, nuclear weapons, nuclear medicine and magnetic resonance imaging, industrial and agricultural isotopes, ion implantation in materials engineering, and radiocarbon dating in geology and archaeology. Such applications are studied in the field of nuclear engineering. Particle physics evolved out of nuclear physics and the two fields are typically taught in close association. Nuclear astrophysics, the application of nuclear physics to astrophysics, is crucial in explaining the inner workings of stars and the origin of the chemical elements.

Street fighting is hand-to-hand combat in public places, between individuals or groups of people. Unlike sport fighting, a street fight might involve weapons, multiple opponents, and no rules. The venue is usually a public place (e.g. a street) and the fight sometimes results in serious injury or occasionally even death.

Brazilian jiu-jitsu (BJJ; jiu-jitsu brasileiro) is a self-defense system, martial art and combat sport system that focuses on grappling with particular emphasis on ground fighting. Brazilian jiu-jitsu was developed from Kodokan judo ground fighting (newaza) fundamentals that were taught by a number of Japanese individuals including Takeo Yano, Mitsuyo Maeda, Soshihiro Satake, and Isao Okano. Brazilian jiu-jitsu eventually came to be its own defined combat sport through the innovations, practices, and adaptation of judo. BJJ teaches that a smaller, weaker person can successfully defend themself against a bigger, stronger, heavier opponent by using leverage to take the fight to the ground, and then applying joint locks and chokeholds to defeat the opponent. BJJ training can be used for sport grappling tournaments and in self-defense situations.

Prāṇāyāma is the practice of breath control in yoga. In modern yoga as exercise, it consists of synchronising the breath with movements between asanas, but is also a distinct breathing exercise on its own, usually practised after asanas. In texts like the Bhagavad Gita and the Yoga Sutras of Patanjali, and later in Hatha yoga texts, it meant the complete cessation of breathing.

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.