Answer: behavioral teratogens. Examples of teratogens are viruses, drugs, chemicals, stressors and even malnutrition. Although teratogens always pose a risk for developing embryos, some do not cause immediate damage. Other factors should also be considered. Factors like the developmental stage the pregnancy, dose, and frequency of exposure, and the genetic makeup of the embryo.
Yoga primarily focuses on rigid control of the body. Thus, breathing is an important part of exercise, and controlling it is important to control other body parts in yoga.