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Hannah wants to improve her cardiorespiratory fitness levels, so she begins to alternate running on a flat track with running up stadium stairs. This principle is known as
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Hannah wants to improve her cardiorespiratory fitness levels, so she begins to alternate running on a flat track with running up stadium stairs. This principle is known as

User Benoit Courtine
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Answer:The answer would be type

Explanation: I just took it :)

User Nubia
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