Yoga is an ancient system of relaxation, exercise, and healing with origins in Indian philosophy. Early descriptions of yoga are written in Sanskrit, the classical literary language of India. The first known work is "The Yoga Sutras," written more than 2,000 years ago, although yoga may have been practiced up to 5,000 years ago. The initial concepts have been adapted over time through translation and scholarly interpretation, but the fundamental principles describing the practice of yoga in the quest of the soul remain largely intact. Yoga has been described as "the union of mind, body, and spirit," which addresses physical, mental, intellectual, emotional, and spiritual dimensions towards an overall harmonious state of being. The philosophy of yoga is sometimes pictured as a tree with eight branches. These eight limbs are: pranayama (breathing exercises), asana (physical postures), yama (moral behavior), niyama (healthy habit), dharana (concentration), prathyahara (sense withdrawal), dhyana (contemplation), and s amadhi (higher consciousness). There are several schools of yoga practice, such as hatha yoga, karma yoga, bhakti yoga, and raja yoga. These schools vary in the proportions of the exercises of the eight limbs. However, they are all similar in working towards the goal of self-realization and control of mental, physiological, and psychological parameters through yogic experiences. In the United States and Europe, hatha yoga is commonly practiced, including pranayama and asanas . Yoga is often practiced by healthy individuals with the aim to achieve relaxation, fitness, and a healthy lifestyle. Yoga has also been recommended and used for a variety of medical conditions. Yoga techniques can be learned in classes or through videotape instruction. Classes last from 30 to 90 minutes and are offered at various skill levels. There is no widely accepted credentialing for yoga instructors.
Various forms of therapeutic superficial tissue manipulation have been practiced for thousands of years across cultures. Chinese use of massage dates to 1600 BC, and Hippocrates made reference to the importance of physicians being experienced with "rubbing" as early as 400 BC. There are references to massage in ancient records of the Chinese, Japanese, Arabic, Egyptian, Indian, Greek, and Roman nations. References to massage are also found in the Bible and the Vedas. Terms for massage include the French word masser , the Greek word for "knead," a Hindu word for "press," and an Aramaic word that means "to press softly." The technique that is currently called Swedish massage was developed in the 19th Century by Per Henrik Ling (1776-1839) as a combined form of massage and gymnastic exercises. Many different therapeutic techniques can be classified as massage therapy. Most involve the application of fixed or moving pressure or manipulation of the muscles/connective tissues of clients. Practitioners may use their hands or other areas such as forearms, elbows, or feet. Lubricants may be added to aid the smoothness of massage strokes. Techniques used in Swedish massage include (1) superficial stroking in a direction away from the heart or deep stroking towards the heart; (2) kneading in a circular pattern using fingers and thumbs; (3) deep muscle stimulation; (4) rhythmic movements such as slapping or tapping; and (5) vibration. Sports massage is similar to Swedish massage but is adapted specifically for athletes. Classical massage aims to provide calmness, relaxation, encourage self-healing, and revitalization. Many other variations and styles of massage or touch exist, often developed in specific geographic regions. Scientific research of massage is limited, and existing studies use a variety of techniques and trial designs. Firm evidence-based conclusions about the effectiveness of massage cannot be drawn at this time for any health condition.