Long runs are essential to the training distance runners because they enable the body to adapt to running greater distances safely and efficiently.

长跑对于训练跑步者十分必要，因为它能够使机体适应安全和高效的长距离奔跑。

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In the information age, in order to save training costs, improve quality of training; distance training courseware should be vigorously developed.

信息时代，为节省培训费用，提高培训质量，应大力开发远程培训课件。

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He worked hard at training his eye and brain to tell the correct distance.

VOA: special.2009.03.18

In horse racing parlance, a horse works a bullet when its morning workout is the fastest of any horse training at the distance on that day.

FORBES: Maryland Racehorse Takes His Morning Workout Down Route 1

Amby Burfoot, who won the 1968 Boston Marathon while still in college at Wesleyan University, said he was doing intense distance training back then that isn't unlike what the top marathoners do today.

WSJ: Breaking the Two-Hour Marathon Barrier

Once they got older, she got more serious about training for long-distance.

NPR: The Finish Line: What The Bombing Was Like