It probably seems like the more often you work out, the better, but spending seven days a week at the gym means missing out on one of the most critical parts of a fitness plan – the rest day. To understand how the rest cycle fits into a comprehensive fitness plan, one must know more about how exercise affects the human body.
Breaking Down Muscle
The goal of exercise is to damage muscle. That sounds counterproductive, but muscle must break down in order to rebuild. This is known as an adaptive response. Working out challenges muscles to the point of fatigue, depleting muscle glycogen. Think of glycogen as the fuel that allows muscles to move. As muscle fatigue occurs, tears form in the structure of the tissue. The body responds to this by looking for a way to avoid tissue damage in the future.