Muscle injuries and dehydration can also trigger cramps. Dehydration is the excessive loss of fluids in the body. Low levels of any of the following minerals that contribute to healthy muscle function may also cause muscle cramps: calcium.
The heart is a part of the cardiovascular system in fact its the main part so if you have heart disease another way of saying this is you have cardiovascular disease.
Increasing cardiovascular fitness means increasing the capability of the heart and the rest of the cardiovascular system in their most important task, to supply oxygen and energy to your body. Having good cardiovascular fitness has many health benefits. For example, it decreases your risk of cardiovascular diseases, stroke, high blood pressure, diabetes and other diseases. Cardiovascular fitness is best improved by activities, which employ large muscle groups working dynamically.