"A fartlek is meant to be a playful injection of speed into a run - less structured than a traditional track workout," explains Laura Norris, a running coach in Boulder, CO. "Fartleks never have set paces, but instead are paced based on how the runner feels."
"These intervals challenge the body in a way that drives the positive adaptability," says Jenny Liebl, an elite trainer in Scottsdale, AZ, and senior content developer for the International Sports Sciences Association.
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