SportsHow to prepare for running a marathonTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoSports09/25/2014September 25, 2014Running a marathon, which is 42 kilometers, is a physical challenge that many runners are keen to try once in their lives. So how do you train sensibly for that?https://p.dw.com/p/1DJVWAdvertisement