These results demonstrate that brain fitness makes a major contribution to physical endurance that is completely independent of physiology below the neck. You don’t even have to exercise to increase brain fitness and fatigue resistance in endurance exercise. All it requires is sustained mental focus on a cognitively demanding task. Of course, building brain fitness through running itself will improve running performance more effectively than building it outside of running. But since the development of brain fitness requires only prolonged task focus and does not require major strain on the
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