What is fastest cardio? It’s running on an empty stomach, and this article explains whether that can affect your weight and performance. By skipping breakfast and running at lunch, I end up doing fastest cardio inadvertently. But, I’ve found unanticipated benefits during long runs and races, which I explain in the video above.
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Jeff is Runner-in-Chief for Runner's World, guiding the brand's shoes and gear coverage. A true shoe dog, he's spent more than a decade testing and reviewing shoes. In 2017, he ran in 285 different pairs of shoes, including a streak of 257 days wearing a different model.