The word yoga is a Sanskrit word meaning union; the union between the individual and the universe.
It was originally a practice of meditation, but over a 10,000 year process it has become something quite different.
Today yoga is much more focused on the physical and involves moving the body through a series of different poses and postures. Each one boasting different benefits for the body.
Some types of yoga have a focus on the spiritual element, and some are purely focused on improving the physical body.