[DaveFr]

In my experience, mindfulness meditation is a form of exercise for your brain. You are increasing your brain's capacity to control, move, and manipulate your thoughts and mental processes, analogous to how weight training might allow you to increase your capacity to control, move, or manipulate heavy external objects.

Sure, it's true that we always "focus" on something, but, like there is a difference in degree between a trained weightlifter and a non-weightlifter, there is a difference in the ability to focus that comes from intentional practice.

Of course there are people who are able to practice mindfulness in their lives without meditation, just like there are people who have strength without going to the gym - they just got a similar result from a different path. It certainly doesn't mean you can't practice mindfulness, any more than the existence of a strong (e.g.) construction worker means you can't practice weightlifting.