You might be a person that really wants to dig deep into how things work. For me, this is not only true of sports, but of everything else, too. Knowing how a muscle contraction works on a microscopic level won’t get you in shape, but it will give you a better understanding of individual effects of your workout – for example, how muscles grow and why, how and why muscles tire, and what limits they are bound by. There are three types of muscle in the human body: cardiac, smooth and skeletal. Cardiac muscle fibers are, as the name suggests, only found in the heart. Smooth muscles work as a mean of transport in organs, for example, to move fluids through the gut. Skeletal muscles connect our bones and allow us to move our bodies. The first two types are involuntary, meaning they are regulated by the autonomic nervous system and not by the conscious mind.