Can this man run a marathon in under two hours?
Eliud Kipchoge wants to run a marathon in under two hours.
The Kenyan runner is currently the marathon world record holder, and has run one in 2:00:25!
But he wants to be the first person to run 26.2 miles in sub two hours.
He will be making a second attempt at the feat in Vienna, Austria, on Saturday. So can he do it?