Excerpt and illustrations from Vitality Supreme, Chapter IV: “Stimulating the Source of Stamina and Vitality” by Bernarr Macfadden, 1915.

After giving consideration to various methods that could be used for the purpose of stimulating this little organ, the thyroid gland, I finally concluded as the result of prolonged experimentation that the exercises illustrated in this chapter can most thoroughly be depended upon for producing results. All movements here described have proved effective in imparting to the neck a full, arched, well developed appearance, but I have given especial attention to the active use of the muscles on the back of the neck. Nearly every movement which to a certain extent develops these muscles is inclined to stimulate the thyroid gland. The more special movements for this purpose are indicated in the various illustrations accompanying this chapter. This development of the back of the neck always indicates great vitality, because definite proof is thereby given that the spine is unusually strong and is maintained in a position favorable to functioning of all the organs of the body.