I haven't read Brain Training, though I remember him mentioning it in the book. I would bet that this is not a rehash of that one. I feel this is very much worth the read. If I remember correctly, when he metioned Brain Traning he did say tha he went over some of these concepts, but on a much more suface level than they are covered here. I'd give you a better answer to the question, but I'm currently 3,000 miles away from my copy of Run and won't be back near it for two weeks. Thanks for reading!