Muscles can be divided into three main types (Cardiac, Smooth, and Skeletal). Cardiac muscles are responsible for such tasks as breathing and the beating of your heart. Smooth muscles cover or wrap around internal organs and blood vessels, and skeletal muscles are used in everyday activities, like walking, swimming, and sitting. For the purpose of this article, we’ll be discussing only skeletal muscles and how they respond to exercise. Skeletal muscles are attached to your bones, which is why they are called skeletal. They’re also the muscles that you look at in the mirror when you’re feeling a little bit vain. These are the muscles that you consciously use to perform your exercises. Skeletal muscles are further divided into two groups: Type I and Type II muscle fibers. Type I (or slow-twitch) … Read entire article »