"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." MY LEGS WERE screaming, my lungs were on fire, and the incline ahead had me stressed. I was in mile two ...

If you’re looking to kick your training regime into top gear, a treadmill pace chart could be one of the best tools for you ...

After running for over a decade, I wanted to see how healthy my heart is. I got an active metabolic assessment at Life Time, measuring my VO2 max and heart rate. I also learned which running speeds ...

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