At just 20 years of age, Konstanze Klosterhalfen became the world's youngest athlete to break three records in the 800 m (under 2 mins), 1500 m (under 4 mins) and 5000 m (under 15 mins).
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Endurance training is fundamentally simple, but not always easy to put into practice. About 75–80% of your sessions should be performed at low intensity, while only 20–25% should be dedicated to high-intensity training.