Now completely updated and revised--a new edition of the long-running marathon training guide that has …
Marathon running has the potential to significantly increase your life-span and positively impact the quality of your life. Again, it is not so much the running of the race affects your health but the lifestyle changes that often accompany the commitment to run a marathon.
— Marathon, Revised and Updated 5th Edition : The Ultimate Training Guide by Hal Higdon (Page 33)