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29. If compelled to work indoors, be sure that the living and work rooms have an ample, continual supply of fresh air. The lower the temperature the better, so long as the body is kept comfortably warm. Temperatures above 70° are depressing. The breathing of cold air is a continuous tonic; every breath is a tonic bath, a vital lift. A thousand breaths an hour count greatly toward health or disease, according as the air breathed is pure and cool, or impure and hot.

30. especially working in the garden, digging, hoeing, pruning, etc. Do some good, hard, muscular work every day, enough to produce slight muscular fatigue and free prespiration; but avoid exhaustion. Exercise out of doors is most beneficial.

Swimming in water at 76° to 78° is the best of all special health exercises. Rapid walking and hill climbing are excellent; stair climbing is good.