And if you slowly lengthen the distance of your longest run, you can slowly build up endurance.
如果你慢慢的增加你的最长距离,你就可以慢慢增加你的耐力。
2
If you were going to run a triathlon, you would spend more time improving your endurance and pacing yourself then sitting on the bench writing out the timing for your swimming, running and biking.