IN JANUARY, I set myself a resolution: to master the humble chin-up. I have never had much upper body strength, and I knew it would be hard, but that is OK, I thought, because I am not doing this to get stronger or fitter. I am doing this for my brain.
Like a lot of people, I used to exercise to stay physically fit. But a few years ago, while writing my book Brain Power: Everything you need to know for a healthy, happy brain, I dug into the literature on exercise and the mind. What I discovered changed my relationship with exercise forever.
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