Based on what is presently known, whoever breaks the 2hr barrier will have a favourable genetic profile (yet to be determined), an outstanding running economy and small body size along with chronic exposure to high altitude and significant physical activity early in life. Current trends also suggest that an East African will be the first to break the 2hr barrier ... anche nel (basso) profilo facebook è usata la descrizione storica del sito che si prendeva 5 anni mica 5 lustri come volevano fisiologi e statistici per scendere sotto le 2 ore in maratona ...