Walk into any fitness center, health club, or gym in the country and you’ll see yourself. Or rather, reflections of yourself. It doesn’t matter whether the gym is one step up from a cave or a posh Park Avenue fitness emporium — you’ll see mirrors, and lots of them. The mirrors aren’t a manifestation of the customers’ narcissism. They’re actually there for an important purpose: to help people do their exercises properly. The mirrors act as a real-time check on your activity, enabling you to immediately adjust to ensure your safety and the quality of your exercise.