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According to http://www.topendsports.com/testing/tests/yo-yo-intermittent.htm: "There are two test levels: the Yo-Yo Intermittent Recovery level 1 (Yo-Yo IR1) test (designed for lesser trained individuals) starts at 10 km/hr and the Yo-Yo Intermittent Recovery level 2 (Yo-Yo IR2) test (aimed at well trained and elite athletes) starts at 13 km/hr, with both levels increasing in speed throughout the test."
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