Patients receiving the drug: It makes the heart beat stronger. If you have trouble breathing. You may be given oxygen to breathe easier and more productive regular exercise improves your cardiovascular fitness. By increasing the capacity of oxygen. It does this by increasing the blood supply to your heart. (And oxygen) to the muscles. This was achieved mainly through increasing the size of the heart pump room. (Cavity), the heart must pump blood to l the same amount of blood. This is evident in the pulse rate. And the heart rate to slow down the intensity. Same exercise