How Much Does Exercise Have To Do With Mental Sharpness And Memory?

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I know I'm answering my own question, but I would like to know other people's experiences with exercise and feeling mentally sharp. Please let me know of differences in mental acuity between weeks or months of not exercising and exercising regularly. I'm particularly interested in those people who have lost a lot of weight and the memory performance differences between being overweight and being at normal weight. Continue Reading Here..)