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.
1 Strength training (lifting weights) will help you build muscle, which in turn increases the effectiveness of cardiovascular and lymph circulation.  Every hour, get up and try 3 to 5 minutes' worth of stretching or small exercise.