Soviet chess masters pretty much cracked the code to brain training. Here’s how: They underwent specific mental drills like: timed pattern recall, blindfolded play, and multi-board simulations, designed to increase prefrontal efficiency and cognitive ability. Soviet chess players also lifted weights, boxed and swam to improve oxygenation, endurance and to train their nervous systems. They even used hormetic stressors like saunas and cold plunges improve stress response and improve parasympatheti