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Experts share the best types of interval training to help you improve both as a long-distance runner and an all-around athlete.

TOOLBOX: Interval Training is popular in cycling and many other sports. High-Intensity Interval Training (HIIT) involves short periods of hard efforts separated by low-intensity recoveries. Let’s dig ...

There’s a lot of talk in the exercise world about high intensity interval training (HIIT) lately, which is exactly what it sounds like — alternating episodes of exercise with periods of less intensive ...