Physical activity and exercise is a major contributor to a healthy lifestyle; people are made to use their bodies, and disuse leads to unhealthy living. Unhealthy living may manifest itself in obesity , weakness , lack of endurance, and overall poor health that may foster disease development. Tips: Regular exercise can prevent and reverse age-related decreases in muscle mass and strength, improve balance, flexibility, and endurance, and decrease the risk of falls in the elderly. Regular exercise can help prevent coronary heart disease, stroke, diabetes, obesity, and high blood pressure. Regular, weight-bearing exercise can also help prevent osteoporosis by building bone strength. Regular fitness can help chronic arthritis sufferers improve their capacity to perform daily activities such as driving, climbing stairs, and opening jars. Regular exercise can help increase self-esteem and self-con...