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The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon.

夏季奥运会最长的田径项目是50公里竞走，比马拉松距离还长大约5英里。

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At the Beijing Marathon, for example, slower runners in the second half of the field often find that the aid stations have run out of water, says Active Network's Su.

活跃网络的苏女士提到：“比如，在北京国际马拉松赛，跑得稍慢的选手往往发现下半赛段的饮水站缺水了。”

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The effects of the Boston Marathon bombings are rippling across track and field as the sport kicks off its spring season.

WSJ: Track Events Weigh Security After Boston Marathon Bombings

If history continues, it may be harder to get a spot this year than to actually finish the race, since it has sold out for 11 straight years, despite hosting the largest field of any half-marathon in the country.

FORBES: The Biggest Half Marathon In The U.S. Start Your Engines?

Next year's field will include 10 men who have run a marathon inside 2:07.

BBC: Tergat confirms London bid