This document summarizes the effects of stress, anger, exercise, and other mental states on the body. It notes that short term stress can cause concentration impairment, insomnia, increased heart rate and blood pressure, while long term stress can damage brain cells and increase risks of heart disease, hypertension, and immune system suppression. In contrast, relaxation techniques like meditation decrease physiological indicators of stress and "recharge" the immune system. Feelings of love and compassion stimulate the brain's reward system and are linked to better health outcomes. Regular exercise provides cognitive, cardiovascular and bone benefits over the long term.