If you’re hearing a snapping or popping sound when you stretch your rib cage, it is most likely coming from your sternum, or breast bone. Your first seven ribs are connected to your sternum and held in place by ligaments and cushioned by cartilage, all of which move together when you stretch. According to Drs.

The tensor fasciae latae muscle, located on the side of your pelvis, helps to stabilize your hip through its connection into a strip of tough connective tissue on your outer thigh called the iliotibial band. Stretching a chronically contracted tensor fasciae latae can help improve the range of motion of your hips.

Popliteus tendinitis is an inflammation of the tendons surrounding the popliteal muscle. The popliteal muscle is located in the back of the knee. The popliteal muscle can be come aggravated as a result of intense physical activity and is also common in those with frequent ankle sprains. According to MayoClinic.

Your calf muscles, comprised of the soleus and the gastrocnemius, are important in your bipedal motion. You use them to walk, run and jump. As such integral muscles, they are prone to injury if not properly strengthened and stretched.

Muscle problems have many possible causes. Inflammation of the muscle, called myositis, causes muscle weakness and wasting. Several types of drugs are linked to the development of myositis in some people.

If you are experiencing weak leg muscles, contact your doctor to determine the cause. Weak leg muscles can be from over-activity, serious illness, pain or vitamin deficiency. Muscles require nutrients such as vitamins, minerals, carbohydrates, protein and adequate fluids to function properly and at optimum levels.

A variety of conditions can cause red blotches to develop on the legs. Because of the many different disorders that may lead to the development of red blotches on the legs, your health care provider will ask if you are experiencing other symptoms.

Ear stretching, also known as gauging, has gained popularity in the United States and other Western societies in recent years. In the process of ear stretching, a healed piercing is slowly enlarged using progressively larger pieces of jewelry.

The clavicle, also called the collarbone, contains a few delicate joints where you shoulders, neck, upper back and chest connect to each other.

Ulnar nerve pain can make it difficult to do the simplest activities. Pain in the hand and fingers can make life pretty unpleasant. The ulnar nerve branches off from the brachial plexus and runs down through the forearm and into the hand, innervating the ring and pinky fingers.

Your abdominal organs are separated by protective coatings that keep your organs in place and support moving and twisting in your body. After abdominal surgery, however, scarring known as adhesions can form in your abdominal cavity, causing pain in the pelvis or abdomen.

While exercising, your muscles feel weak, painful and tired. This is muscle fatigue, and it can be caused by a variety of physical, environmental, biochemical and nutritional factors. Writing in the December 1998 issue of the "European Journal of Applied Physiology"