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.
Your chest muscles are made up of two portions, the pectoralis major -- the larger portion on top -- and the pectoralis minor. Doing pectoral exercises with free weights trains both portions, because the weight resistance tears and rebuilds your muscles stronger than before.