MARATHON RUNNER AIMS TO BREAK TWO-HOUR BARRIER

Kenyan athlete poised for challenge in Vienna

Kenyan athlete Eliud Kipchoge will be in illustrious company if he manages to run the first sub-2-hour marathon - a boundary of human endurance that has resisted every attempt to break it.

Success would rank alongside individual sporting achievements that include British runner Roger Bannister breaking the 4-minute mile; Nadia Comaneci, from Romania, becoming the first gymnast awarded a perfect 10; Jamaican Usain Bolt sprinting 100 meters in 9.58 seconds; and Germany's Steffi Graf holding the world No 1 ranking in women's tennis for 377 consecutive weeks.