Physiology of marathons certain physiological characteristics of marathon runners exist. The differing efficiency of certain physiological features in marathon runners evidence the variety of finishing times among elite marathon runners that share similarities in many physiological characteristics. Aside from large aerobic capacities and other biochemical mechanisms, external factors such as the environment and proper nourishment of a marathon runner can further the insight as to why marathon performance is variable despite ideal physiological characteristics obtained by a runner. The first marathon ever run was an unintentional 25 mile trek performed by Pheidippides. Pheidippides was a Greek soldier who ran to Athens from the
2014 London Marathon with spectators standing 10 to 15 people deep, turned out to cheer on the competitors in warm weather. The race began in Greenwich in South East London, passing by many of London's most famous landmarks, before finishing on The Mall. The men's elite race featured a particularly strong field, including marathon world-record holder Wilson Kipsang, reigning Olympic and world marathon champion Stephen Kiprotich, 2013 London Marathon champion Tsegaye Kebede, and London course-record holder Emmanuel Mutai. Other notable competitors included Geoffrey Mutai, who unofficially ran the fastest marathon ever; Ayele Abshero, who has the fastest marathon debut; Xiamen and Dublin marathon