1. PRIMARY: Using a randomized, parallel group design, this investigation will determine if the combination of 2-weeks polyphenol supplementation (using the Reoxcyn flavonoid supplement in capsule form) and one acute 45-minute brisk walking bout enhances the translocation of gut-derived phenolics into the circulation. A comparator group of runners (N=20) ingesting the flavonoid supplement for two weeks will be included (2.5 h run, 70% VO2max).