Physical exercise with purposeful manual labor can arouse a dormant will, normalize the imagination, and aid in disease recovery.

Original passage

In all these cases well-directed physical exercise would prove an effective remedial agent. In some cases it is indispensable to the recovery of health. The will goes with the labor of the hands; and what these invalids need is to have the will aroused. When the will is dormant, the imagination becomes abnormal, and it is impossible to resist disease.