30分钟的跑步时间内，为自己设定一个终点目标，这个目标可以是电线杆、几棵树、几座楼房，或者是其他的跑步人士。
Easy fartlek.Fartlek, or speed play, is variable-pace running that emphasizes creativity.During a 30-minute run, choose objects to run to telephone poles, trees, buildings, other runners, whatever.
30分钟的跑步时间内，为自己设定一个终点目标，这个目标可以是电线杆、几棵树、几座楼房，或者是其他的跑步人士。
Easy fartlek.Fartlek, or speed play, is variable-pace running that emphasizes creativity.During a 30-minute run, choose objects to run to telephone poles, trees, buildings, other runners, whatever.
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