Question

select the correct answer.
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.

Explanation:

Cardio activities are designed to improve the function of the heart and lungs (cardiovascular system), while strength - training activities are focused on increasing muscle strength and mass. Option B correctly states that cardio activities work the heart and lungs and strength - training activities strengthen muscles. Option A is incorrect as strength - training is not about the heart and lungs. Option C is wrong because it's the opposite (cardio is usually more sustained, not short bursts for most common cardio like running, swimming etc., and strength - training can have short bursts but the main difference is the target body system). Option D is incorrect as improving joint range of motion is more related to flexibility exercises like stretching, not the main difference between cardio and strength - training.

Answer:

B. Cardio activities work your heart and lungs, while strength - training activities strengthen your muscles.