You have 6 hundred muscles, and they are the reason you can digest your food, pick things up and put them down. Some of them are under your control; they do your bidding, like when you measure out a cups of rice. Some of them do their own thing, like when your body turns that rice into energy after you have cooked and eaten it.
There are 4 types of muscles:
Skeletal Muscles: Imagine walking across the room, and thank your skeletal muscles. Your skeletal muscles are voluntary – they do what you want them to do. Your skeletal muscles are voluntary – they do what you want them to do. Your skeletal muscles are strengthened by your weight – bearing exercise, strengthening exercise, and cardiovascular exercise.
Visceral Muscles: See how you are breathing quietly while reading? You aren’t thinking, breathe, breathe, breathe, are you/ Thank your visceral muscles, which do their thing independent of your conscious brain. Your visceral muscles are thin sheets that cover you inner organs, and they have secret, silent responsibilities that keep you alive, like contracting your digestive system in rhythmic movements called peristalsis, which is what moves your food from one digestive organ to the next.
Cardiac Muscles: Put your hand over your heart. Your cardiac muscles make your heart beat, and they are found only in your heart.
Hybrids: Take a deep breath. The hybrids, like your diaphragm, control breathing unconsciously, but you can breathe more slowly and deeply if you try.
-Diaz, Cameron. The Body Book: The Law of Hunger, the Science of Strength, and Other Ways to Love Your Amazing Body. N.p.: HarperCollins, n.d. Print.