There are five forms of prana.They have different names according to the bodily functions with which they correspond. These forms of prana are.
1 Udana-Vayu ,corresponding to the throat region and the function of speech.
2 Prana-Vayu,corresponding to the chest region
3 Samana-vaya,corresponding to the central region of the body and the function of digestion.
4.Apana-vayu,corresponding to the region of the lower abdomen and the function of elimination.
5.Vyana-vayu,corresponding to the distribution of energy into all areas of the body.
Vayu is a sanscrit term meaning “air” or “breath” These Vayus are very important factor in keeping health.