Little is known about yoga use and its relation to well-being in cancer survivors .among survivors in the nurse health study , yoga use was associated with better quality of life .however ,analysis of the 2002 NHIS indicate more complex relations with well-being: for male cancer survivors ,depression was positively associated with doing yoga , but for female survivors ,depression was inversely associated with doing yoga .however yoga use was positively associated with insomnia , but only for women.