Claire Kowalchik is the former managing editor at "Runner's Claire Kowalchik is the former managing editor at "Runner's World." She has also been a book editor at Rodale Press, andWorld." She has also been a book editor at Rodale Press, and written for numerous sports and fitness publications. She h written for numerous sports and fitness publications. She has run eight marathons and countless races, and is an assistas run eight marathons and countless races, and is an assistant instructor for a women's running group. Claire currentlyant instructor for a women's running group. Claire currently...