Are you curious?
When you are curious about something, the ability to focus comes naturally. With focus, a new dimension opens. The artist catches the muse. The dancer enters the flow. The inventor cracks the puzzle. It's about sustained attention; entering the place where everything disappears, even you. In that place, only the living moment remains. Everything seems to happen by itself.
This is the simplest most elusive undertaking; to keep the mind on point. If you try too hard, you get in your own way (and end up with a headache). Don't try at all, and it's endless mind-wandering.
The secret is curiosity.
Not brute force.
Attention flows naturally -- almost effortlessly -- toward whatever we are genuinely curious about.