which keeps me fit and agile. I do yoga 2 times a week, I do cardio 2 times a week, and 2 times a week, I focus on flexibility, stretching, weight training, and I tend to take 1 day off per week. All of these are very important for chess. You need to have the stamina to last 6 or 7 hours of intense mental effort, but you also need to be flexible to be able to sit comfortably and