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jayleserodriguez:

What is the main difference between cardio and strength-training activities? A. Cardio activities increase your physical strength, while strength-training activities work your heart and lungs. B. Cardio activities work your heart and lungs, while strength-training activities strengthen your muscles. C. Cardio activities require short bursts of energy, while strength-training activities strengthen your body over long durations. D. Cardio activities improve your joints' range of motion, while strength-training activities work your heart and lungs.

Sacredcheats:

It's not c or d

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