Your cardiovascular system gets better when you increase the time and intensity of your workouts. What should the word in italics be replaced with to make this sentence more precise?

The word better should be replaces with stronger and efficient.

Explanation:

The cardiovascular system of the body works better if the the body id performing intense workout and the heart becomes more efficient.

The workout sessions provides more oxygen to the heart which makes it stronger and provides more oxygen to the vital organs of the body.

There are less chances of occurring the problems related to the cardio vascular system of the body such as high blood pressure, blockage, et cetera.

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