JOHN "THE PENGUIN" BINGHAMwrites a column forRunner’s Worldmagazine and teaches the basics of running to adult-onset athletes. The author ofNo Need for Speedand coauthor (with Jenny Hadfield) ofMarathoning for Mortals,he lives in Chicago. JENNY HADFIELD, MA, CPT,is a fitness expert who has trained thousands of walkers, run-walkers, and runners of all levels. Her gentle yet uncompromising approach to training combined with her unique insights into the human body and mind will help readers discover their inner long-distance athlete. She lives in Chicago.