Mindfulness is not thinking, this is one of the reasons it is so powerful.

It is a common view that mindfulness is thinking — Now I’m walking. Now I’m talking. Now I’m not walking or talking, but just standing. Now I’m sitting down... It is just like a running BBC commentary. But, as a matter of fact, words cannot describe these things. Words can never describe what you do when you walk. There is only the actual living experience. If you say ‘walk’, does that mean the toe comes down first, the heel comes down first, or the foot comes down flat? The living experience is awareness of it all, but words can never describe it.