A light cyclist has a huge advantage in non-flat terrain. He needs strong legs and light everything else. A runner needs core and back muscles to run in a way t

A light cyclist has a huge advantage in non-flat terrain. He needs strong legs and light everything else. A runner needs core and back muscles to run in a way that does not waste a lot of energy and prevents injuries. In my experience running is harder on your entire body, cycling just on legs and lungs.