Doing physical exercise means moving our body parts regularly according to some rules. There are different types of physical exercises, like walking, running, swimming, and cycling. Walking and swimming are really good exercises for people of all ages. Doing physical exercise is important to keep our body fit and our mind healthy. Our body and mind are closely connected. If we want a healthy mind, we need a healthy body too. Physical exercise helps us make our health better. There's a saying, "Being healthy is like having lots of valuable things." A truly happy person is someone with good health. Even if someone doesn't have much money, they can enjoy life a lot if they're physically fit. Physical exercise helps us get better health. And since health is the foundation of all happiness, if we want to be happy, we should exercise regularly. Our human body is compared to a machine. Just like a machine can get rusty if not used, our body becomes inactive and weak if we don't exercise. Doing physical exercises keeps our body active and our muscles strong. It also makes our digestion and blood circulation better. It gives our brain more strength. But we have to remember that too much of anything is not good. Exercising too much can also be bad for health. It can affect our body and mind negatively. So, we should follow the rules of physical exercise. Everyone should do regular physical exercise to have good health and a happy life.