During the last thirty years, many doctors and scientists have tried to experiment on yoga and its effects on the body. In fact, they thought that yogasanas were some sort of gymnastic exercises for the body and muscles. Therefore ,the earlier teaching methods of yoga were very dynamic. They had speed and momentum . In the meantime ,my guru.
The first book he printed was pranayama and long life yogasanas and good Health.That book was published by a large publishing house in India and was circulated thruoghout the world.Swami Sivananda indicated which asanas were good for which particular diseases . He introduced the idea that yoga is not merely gyamnastic exercises, but has a far -reaching influence on all internal processes of the human body.
At first it was dfficult for the scientific -minded people to accept this .He can asanas,postures ,pranayama,breathing,and hatha yoga shatkarmas, practices of purification ,check 'incurable' diseases like asthma,diabetes,blood pressure,:skin diseases like allergic dermatitis,psoriasis;peptic ulcers,duodenal ulcers,gastric ulcers;arthritis,rheumatism?In the beginning it was hard to believe ,people could believe that exercises promote good health,but there was no scientific evidence as to how asanas worked on the human body .
imbalance In the endocrinal system
There are many glands in the human body. Some are called endocrine glands for they inject hormonal fluid directly into the blood vessels. and others are called exocrine glands ,about which we are not concerned now. This endocrine system is important as it can completely change the structure of the body,the nature of a person,his temperament ,and many other things.
The thyroid gland which is situated in the lower part of the throat is responsible for controllling the temperature in the body. Usually around the age of twelve it starts functioning ,and at the age of seventy or eighty it stops.Of course,it can stop earlier ,at about fifty- eight or sixty. During all these years this gland prouduces,at the most ,a total amount of about 1/4 teaspoon of hormonal secretions,which is injected into the blood vessels regularly in minute quantites .With that tiny amount of hormone we maintain our rate of metabolism,inner body temperature and emotinal balance.
In the same way ,there are other glands in the body. like the pancreas for the production of insulin. adrenal glands for adernalin,and gonads for sperm and ova. Imbalance in the endocrinal system is a major factor responsible for disease . 
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