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Before intensive training sessions, such as interval training or a tempo run, but also before a competition, it is important that you warm up properly. Sonja von Opel tells you how best to do this and why you should also cool down afterwards in this video from the series "RUNNER'S WORLD explains...". The chapters in this video: Introduction: 0:00 Warm-up: 0:30 Cool-down: 6:00 Tips: 8:05