Regular physical activity can improve your muscle strength and boost your endurance. Exercise delivers oxygen and nutrients to your tissues and helps your cardiovascular system work more efficiently. And when your heart and lung health improve, you have more energy to tackle daily chores.
<span>Maggie would build muscular strength because she has chosen such a heavy weight. While she will build some muscular endurance by lifting, she will primarily be building strength. To gain endurance one would lift lighter weights with higher repetitions. Heavy weights with low repetitions builds more muscle, faster.</span>
it's the circulatory system,the heart and blood vessels
