There are many kinds of yoga.  The word "yoga" comes from the Sanskrit root yuj, which means "to join" or "to yoke". 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. This is a simple definition.  The practice of yoga makes the body strong and flexible, it also improves the functioning of the respiratory, circulatory, digestive, and hormonal systems. Yoga brings about emotional stability and clarity of mind.  The he exercise of Yoga begins the student on a conscious journey to discover what simply is. Who are you? and what you can become.

There are several branches of yoga that a student may practice:

The  Yoga of wisdom is called Jnâna-Yoga.  The Yoga of meditation is called Râja-Yoga.  The Yoga of physical processes   is called (Hatha-Yoga.  The Yoga of service is called Karma-Yoga. The Yoga of devotion is called 
                         Bhakti-Yoga. 

   What many people view as    "Yoga" is
   primarily the practice of asanas   (exercises)
   and pranayama (breathing), but  yoga is
   much more.  With continued   dedication
   and practice, Yoga can take you  far beyond
   any workout routine, and help  you live life
   in a more proactive state.  The   inner peace
   that will be found will radiate outwards and
   life will become one of greater   joy and
   experience.  Click here to see the  different
   types of chakra.