Final answer:
Regular aerobic exercise has been shown to improve symptoms associated with central nervous system disorders and is recommended for neurodegenerative disorders. Exercise has also been beneficial in treating drug addiction and brain cancers.
Step-by-step explanation:
The evidence for prescribing exercise as therapy in 26 different chronic diseases is significant. Regular aerobic exercise has been shown to improve symptoms associated with central nervous system disorders such as major depressive disorder and attention deficit hyperactivity disorder. It has also been recommended as a treatment for mild cognitive impairment, and as an adjunct therapy for neurodegenerative disorders like Alzheimer's disease and Parkinson's disease. Additionally, there is evidence supporting exercise as an adjunct therapy for drug addiction and brain cancers.