Physical activity can significantly reduce the risk of coronary artery disease. This may be related to the fact that exercise often helps in maintaining a healthy weight, as well as safe blood pressure and cholesterol levels.

When the body's major muscle groups are regularly caused to work against a form of resistance, the muscles can become stronger and larger. This kind of exercise is known as strength training, resistance training, or weight training.

A primary goal of physical exercise is often to improve the strength of the heart muscle itself. The heart can grow stronger through regular, sustained periods of increased effort.

There are several factors to consider when determining a personal program of physical fitness. It's important to accurately assess your initial fitness level, set reasonable goals, choose an appropriate activity to reach those goals, and monitor your progress.