Usually involves strenuous or costly effort related to physical exercise. It's when you put in a lot of physical effort. Exercise benefits every part of the body, including the mind. Exercise causes the body to produce endorphins, which are chemicals that can help a person feel calmer, happier and help some people sleep better. Exercise can also help some people who have low self-esteem or mild depression. Additionally, exercise can give people a real sense of accomplishment and pride in having achieved a certain goal, such as beating an old time in the 100-meter dash. Exercise can also help you lose weight and burn more calories. Exercise can also help obesity. Obesity is when you are overweight. Obesity increases the risk of heart disease, two types of diabetes, hypertension, some cancers and other chronic cancers