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。
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。
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。
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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