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The muscular system is the network of body tissue or muscle bands that are formed over your skeleton frame. The muscles, in conjunction with the skeleton and the body's nervous system work together to move the body and guide it through various activities and positions. Certain muscles are more dense than others as a result of certain activities such as cycling or weightlifting which helps develops the thighs or arms and which are expected to carry heavier loads. A chart of the muscular system would be beneficial in helping one understand what muscles are located where in the human body. If one seeks to improve their ability in a particular function, the chart will assist in describing which muscles to train.