Read the following excerpt from a short article:

"Every day, countless individuals forget the importance of physical activity. In our increasingly sedentary lifestyle, it is vital to remember that engaging in regular exercise not only boosts our physical health but also enhances our mental well-being. A short walk can do wonders for your mood, while a few minutes of stretching can relieve tension and help clear your mind. Don’t let your busy schedule prevent you from incorporating movement into your day!"

What is the author's primary purpose in this excerpt?