Week one pull up top of spine exercises. Day three stretch system of pulleys and levers are created by the skeletal muscles and bones in the body. Notice they're called skeletal muscles because they are attached to the skeleton. Unlike the cardiac muscle, which is found in the heart, all you need to remember is that skeletal muscle by nature, a contract and shorten B, relax and lengthen. For example, the bicep is connected to both the shoulder and the top of the forearm crossing over that elbow. This means that when the tissue contracts in the bicep, the muscle tissue shortens pulling the arm up.

Try this for yourself, sit or stand with your right arm down by your side and place the fingertips of your left hand on your right bicep. Now contract the right bicep feeling and getting shorter and more compact. Also, notice The lower arm raises up. Imagine holding this contracted face for six hours. When you're finally asked to lower the arm back down, it would feel stiff and tight. You'd have to gently lower the hand back down, stretching the fibers of the bicep to re lengthen it.

This is what happens to the skeletal muscles in your neck after a long day of leaning your head forward, thus contracting those muscles for a long period of time. To prevent stiff, tight muscles in the neck, they need to be gently stretched, so it's easier to maintain good posture. Please note when doing this exercise, that if you feel any pain in either the left or right side of the neck, ease back to a range that is comfortable. Over time that discomfort will ease but for now, follow your body's guidelines. Finger one g showing the bicep and tricep muscle. Notice how they oppose one another when the bicep shows It pulls the arm up.