I’m vegan and I have high blood pressure. I take medication and the BP is under control now. I wonder if he can practice this breathing exercise of yoga without fear? I have read in several places that holding your breath can be dangerous. Thank you. PS: This is Dr. Weil’s breathing book. * Exhale completely through your mouth, making a whoosh sound. * Close your mouth and inhale quietly through your nose to a mental account of four. * Hold your breath for a count of seven. * Exhale completely through your mouth, making a whoosh sound to a number of eight. * This is an encouragement. Now inhale again and repeat the cycle three more times for a total of four breaths. Note that you always inhale quietly through your nose and exhale audibly through your mouth. The tip of the tongue stays in position all the time. Exhalation takes twice as long as inhalation. The absolute time that happens in each phase is not important, the ratio of 4:7:8 is important. If you have trouble holding their breath, the speed of exercise, but to maintain the ratio of 4:7:8 for the three phases. With practice you can slow down everything and get used to inhale and exhale more deeply. This exercise is a natural tranquilizer for the nervous system. Unlike tranquilizing drugs, which are often effective when you first, but then lose their power over time, this exercise is fine the first try, but the gains in power with repetition and practice. Do at least twice a day. You can not do too often. Do not make more than four breaths at the same time for the first month of practice. Then, if you wish, you can expand to eight breaths. If you feel a little dizzy when you first breathe this way, do not worry, it happens. This is why I am concerned: It is very important not to hold the breathe. You must breathe to make the positions if you want to achieve maximum benefit. Remember to breathe slowly, rhythmically and fully. Holding your breath only cause stress and make it more difficult to maintain a posture