Yoga is a system of discipline that is dated over 5,000 years old.
Yoga means union with the self.
The male and female, yin and yang, Shiva and Shakti, sun and moon, heat and cold. There is more to yoga than the stretches, but it is the easiest part of the discipline to learn before incorporating the other components. It encompasses eight systems combining mental, emotional and physical aspects. Hence the eight limb yoga system or Astanga yoga. Other types of Yoga are Hatha yoga, Kriya yoga, Tantric yoga, Iyengar yoga, Kundalini yoga, Bhakti yoga, Raja yoga, Karma yoga to name a few.