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Why Running Is Such Perfect Cardio
Visitfor coverage from TIME, Health, Fortune and moreGo »viralThe Internet Can't Decide What This Guy's Mind-Boggling Promposal Sign Is SayingcelebritiesEllen and Bradley Cooper Refuse to Let Nugget Boy Come for Their Retweet RecordmoviesWatch Rey Learn the Ways of the Force in the First Star Wars: The Last Jedi TrailermoviesA Quiet Passion and the Real Emily DickinsonExercise/FitnessMarkham Heid10:36 AM ETTIME HealthFor more, visit TIME Health.There was once a time, just a few decades ago, when few people ran to stay in shape. Today, running is almost synonymous with exercise. If your goal is to be fit and healthy, you’re either a ...