An erect body means a deeper chest, room for the important organs to work and thus affords them the best chance to act.
A few setting-up exercises each day in the erect position will help greatly to get this result.
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Exercise 1
Position: Heels together, arms down and at sides, palms in.
Movement: Swing arms, sideways, upward to vertical, and return.
Exercise 2
Same as Exercise I, except that arms are swung forward, upward to vertical.
Exercise 3
Position: Arms extended to side horizontal.
Movement: Swing forward and return.
(Emphasis upon backward movement.)