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Spring is right around the corner and that means one thing: Time to start training for those summer and fall races! But the treadmill can’t compete with fresh air, sprouting flowers, and sunshine. So if you’re looking for a new place to explore by foot or want to throw a long run into your next vacation, look no further — these 10 trails are not only sure to keep your heart rate up, but they boast some of the best views America has to offer.

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