[ggoss]

This, and if you need further justification, think of this like any other skill. By practicing the act of intense (and nonjudgmental) focus, over time, your ability to focus intently will improve. In choosing to focus on something internal, you decouple this practice from any particular external context or environment, and any improvement you achieve will be applicable to the broadest range of tasks. In calmly accepting (and dismissing) any intrusive thoughts or feelings, you likewise improve your ability to remain calm in the face of unintended internal or external distractions, decreasing your stress levels (along with any of their negative health implications). Go into it without any expectations (as you might then stress if you fail to meet them), for the most benefit. Nothing else required, just the intentional and unimpeded practice of a particular skill.