Derived from the Sanskrit word yuj, Yoga means union of the individual consciousness or soul with the Universal Consciousness or Spirit. Yoga is a practical aid, not a religion. Yoga is an ancient art based on a harmonizing system of development for the body, mind, and spirit. The continued practice of yoga will lead you to a sense of peace and well-being, and also a feeling of being at one with their environment.
Yoga is not just about bending or twisting the body and holding the breath.
It is a mechanism to bring you into a state where you see and experience reality just the way it is. If you allow your energies to become exuberant and ecstatic, your sensory body expands. This enables you to experience the whole universe as a part of yourself, making everything one – this is the union that yoga creates.
The ultimate goal of Yoga is moksha (liberation), although the exact definition of what form this takes depends on the philosophical or theological system with which it is conjugated.