Exclusive Sunday preview | MagazineThe great running experiment

Kara Goucher is part of the lead pack of female Boston marathoners powering up Heartbreak Hill in 2009.

http://www.bostonglobe.com/magazine/2013/03/30/boston-marathon-can-right-preparation-really-make-one-person-faster/btxCBnT3zYf4zT96nVu8rM/story.html