Excessive negative stress has been linked to many diseases and disorders such as hypertension, coronary heart disease, cancer, ulcers, insomnia, back pain and headaches. Exercise helps release built-up tension in the body. Physical activity releases endorphins, promoting a feeling of well being. Some forms of exercise allow you to be social, which can also be a great stress reduction. Exercise can also raise feelings of self-esteem which can bring other benefits that improve quality of life. Exercise is an excellent stress reduction tool.