Exercising the muscles can be hard work, depending on your diet and training level you push yourself to yourself. The diet is essential for those looking to gain muscle mass. Besides a good diet custom with enough protein, you have to do some exercises to get muscles that are made in the gyms, and equipment.
Many times when we do exercises to strengthen muscles we forget the back muscles, perhaps because it is the part we do not see the look in a mirror. A shapely back, along with the arms, shoulders and chest, of the work should be fitness to develop all the muscles of the body in harmony.