Placing your hands against the sides of a narrow door way, allow
your weight to come forward upon the hands, the knees straight.
Take a full breath, then carry the body back by action of the arms.
This presses the shoulders back and causes expansion of the chest, and a
deep breath should, of course, be taken. The exercise should be repeated
many times.
This exercise, as well as all others, should be practiced where the air
is pure.
Observe that this exercise can be made more severe by placing the feet
farther back from the door so that the weight of the body will fall more
upon the hands. In this case the hands may be lower. They should be
placed slightly below the shoulders.