Answered

Spending three hours a week doing _____ exercise will strengthen your heart and increase the ability of your muscles to use oxygen.

Answer :

cardio exercise is the answer

meganhankel
the answer is aerobic.

 Aerobic exercise is sometimes known as "cardio"- exercise that requires pumping of oxygenated blood by the heart to deliver oxygen to working muscles.

It strengthens your heart and muscles, and burns fat.

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