Exercise is good for the psyche. One of the benefits of exercise is its effect on mental well-being. A Surgeon General's Report shows that people who are inactive are twice as likely to have symptoms of depression as those who are active. Studies reported in the UC Berkeley Wellness Letter show that walking, running, weight training, sports, or simply being physically active can lift mood and keep people positive. Oddly, they get the benefits whether or not the exercise leads to significant improvements in physical fitness. Exercise increases production of brain chemicals that influence mood. 30 to 40 minutes of exercise 3 to 5 times per week produces is sufficient to produce many positive results.
Anyone starting an exercise program should check with their physician before doing so.