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by fdanconia21 2437 days ago
It's a group of runners there to keep up the running pace, to block wind and generally add morale.

Over the duration of the attempt, runners will hop in and hop out of the run to keep the running pace alongside Kipchoge as well as block wind (a non-trivial factor) over 26.2 miles. Also, it is mentally boosting to have teammates and even competitors of his run along side him as he pushes his body and mind farther than he has ever had before.