原文： First, it is important to understand the significance of regular exercise. It has been proven to have numerous physical and mental health benefits, such as reducing the risk of chronic diseases, improving heart health and promoting better sleep.

重述：Understanding the importance of regular exercise is crucial, as it has been scientifically proven to have various physical and mental health advantages. For example, it can reduce the likelihood of chronic illnesses, enhance the functioning of your heart, and promote restful sleep.