In today’s fast-paced world, fitness apps have become a popular tool for tracking and improving health. There are many youngsters who use these fitness apps blindly. As the country moves towards Fit India, it is time to understand the pros and cons of fitness apps. Write an article for your school magazine educating the youth on the pros and cons of fitness apps. You are Kirti/Kirat, a school fitness coach. You may use the following cues along with your own ideas to compose the article.
Find the interval in which $f(x) = x + \frac{1}{x}$ is always increasing, $x \neq 0$.