There are many varieties of pranayama,or controlled breathing practices,that are prescribed to nonpregnant yoga practitioners.
Pregnant women should do a type of pranayama known as bhastrika (bellows breath) or an easier practice known as surya bhadan.Surya bhadan begins by inhaling with the rigth nostril for the count of two,then holding for a count of eigth,and exhaling for a count of two.Pregnant women should be sure not to hold the breath longer than is comfortable.The practice should be relaxing and gentle.