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Here's how exercise intensities are typically defined:
Low-to-moderate: This is an intensity that can sustained relatively comfortably for a long period of time (about 60 minutes). This type of exercise typically begins slowly, progresses gradually and usually isn't competitive in nature.
Vigorous: This is an intensity that is high enough to significantly raise both your heart and breathing rates, and is usually performed for about 20 minutes before fatigue sets in.
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