True, 100% true. Exercise is extremely beneficial for every part of the human body, which is why it is endorsed by millions of doctors, dietitian, athletes, and parents.
Physical activity can help you loose calories and strengthen yourself, which can help you keep a healthy weight. It can also boost your mood because it releases more endorphins (natural mood lifters) and it helps you getting your sleep patterns back to normal. Finally physical activity can help reduce risk for diabetes, heart attack, and stroke because it increases the insulin sensitivity of your cells, it increases levels of good cholesterol flushing out artery-clogging, and improves health of blood vessels and indirectly improves the risky traits such as high blood pressure.