The article discusses the idea that regular exercise may be the best cognitive exercise, suggesting that physical activity can be more computationally challenging for the brain than traditional cognitive exercises like sudoku. The author notes that while computers can reproduce many cognitively hard tasks, they still struggle with physical tasks like navigation and manipulation. The article proposes that exercise may be a key factor in maintaining cognitive health. The idea is that physical exercise requires complex computations and adaptations, which can help keep the brain healthy and active.