YDS PARAGRAF DOLDURMA / TEST 4 17. Soru

17.

- Your heart is a muscle. It works hard,
pumping blood every day of your life. You
can help this important muscle get stronger
by doing aerobic exercise. ----. So aerobic
exercise is a kind of activity that requires
oxygen. When you breathe, you take in
oxygen, and, if you're doing aerobic
exercise, you may notice you're breathing
faster than normal.