Yoga physiology described humans as existing of three bodies (physical, subtle and causal) and five sheets (food sheet, prana-breath, mind sheet, intellect, and bliss)[13] which cover the atman, and energy flowing through energy channels and concentrated in chakras.
Many studies have tried to determine the effectiveness of yoga as a complementary intervention for cancer, schizophrenia, asthma, and heart disease.[14][15][16][17]