The ability to regulate your breath, to calm down, is helpful when you want to focus on some problem, which is usually a chess game. My fitness tip to all मन की बात listeners would be to keep calm and focus on the task at hand. The best fitness tip for me, absolutely the most important fitness tip, is to get a good night's sleep. Do not start sleeping for 4 and 5 hours a night. I think 7 or 8 is an absolute minimum.