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According to the article, how does the intermittent recovery test differ from the intermittent endurance test?

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The second part of FITT is "intensity." This refers to the amount of effort expended in a particular workout. It is important to find a good balance of intensity during the workout in order to burn energy but prevent injury. One way for individuals to do this is to determine their target heart rate, and then try and stay inside that zone.

teens need 8-10 hours of sleep. it kind of depends on what time you get up. but prob around 10 or 11 p.m. or 11 or 11: 30 p.m.