Watermelon has a high amount of potassium. Potassium is considered a vasodilator, meaning that it releases the tension of the veins and arteries, thereby stimulating increased blood flow and reducing the stress on the cardiovascular system. The antioxidants present in watermelon also prevent hardening of the veins.
Apples, being rich in fiber, help in the digestive process. Regular consumption of apples scrapes excess cholesterol out of your veins and arteries to ensure proper heart health and blood circulation.