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Forget HIIT, fartlek is the hottest training method for smooth legs this summer

Forget HIIT, fartlek is the hottest training method for smooth legs this summer

If you get bored of intervals you can also try fartlek. Fartlek have nothing to do with passing wind or other discomfort - fartlek means "speed play" in Swedish. Fartlek training involves the random change of pace while running - anything from sprinting to walking, with random and continuous change of speed every few seconds during your routine.