The LEAST reliable way to assess physical exertion during exercise from the options provided is measuring one’s body composition.
Body composition assessments (such as measuring body fat percentage via calipers or bioelectrical impedance) do not provide immediate or direct feedback on the intensity of physical exertion during exercise. In contrast, checking one’s pulse, testing blood pressure, and analyzing breathing ability can provide more immediate and relevant information regarding how hard a person is working during exercise.
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