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Why do you need to gradually increase your physical activity to stay within your fitness target zone?

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Since your body gets used to the current physical activity so you must increase or change your physical activity in order to stay within your fitness target zone.
User Thegunner
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Answer:

A rule that states that the amount and intensity of physical activity needs to be increased gradually. ... Physical activities that the heart can supply adequate oxygen to the muscles and allow performance for a long period of time.

Step-by-step explanation:

User Caltor
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