If you're a beginner, just focus on logging miles. If you're more experienced, add speedwork.

如果你是一个新手，仅仅关注里程数就够了；如果你是富有经验的老手，可以增加速耐力跑训练。

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Messy winter weather can make track workouts and other types of speedwork difficult to do consistently and safely. Not so for fartlek workouts.

麻烦的冬季让越野跑和其他速度训练变得难以安全的持续进行，但是法特莱克训练不会受到影响。

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You should wear performance-training shoes if you are a runner who wants a light, well-balanced shoe suitable for racing, speedwork, or daily training.

如果你在为竞赛、速度练习或者日常训练寻找一双轻便、平衡性好的跑鞋，那么性能训练跑鞋就是你的选择。

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