It usually involves strenuous or costly exertion related to physical exercise. It’s when you push yourself a lot physically. Exercise benefits all parts of the body, even the mind. Exercise causes your body to produce endorphins, which are chemicals that can help a person feel more peaceful, happier, and help some people sleep better. Exercise can also help some people who have low self-esteem or mild depression. Plus, exercise can give people a real sense of accomplishment and pride in having achieved a certain goal, like beating a good old time in the 100 meters. Exercise can also help you lose weight and burn more calories. Exercise can also contribute to obesity. Obesity is when you are overweight. Obesity increases the risk of heart disease, two types of diabetes, high blood pressure, certain cancers and other chronic diseases.