Regular exercise is the best way to prevent lower back pain, but you shouldn't exercise while you have severe back pain, according to "Low Back Pain," a report by The Merck Manuals Online Medical Library.

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Lower back pain is the most common work-related disability. Most instances disappear after a few days -- if your pain lasts for more than three months, it's considered chronic. Low-impact exercises, especially walking, are appropriate activities if you suffer from recurring lower back pain.

Having tight muscles in the low back impedes flow of blood through the muscles and can cause painful cramping and spasms. Tight muscles are weak muscles that are in a constant state of contraction, says licensed massage therapist Julie Onofrio on the Massage Seattle website.

Sharp pains in your abdomen can be as minor as gastrointestinal gas, or as serious as appendicitis. Movements such as stretching or twisting of your torso and abdomen may aggravate your symptoms. Treatment varies based on the cause, but may include rest, over-the-counter medications and in some cases surgery.

Hurdle stretches have been used by sports teams and physical education teachers for years to stretch the hamstring muscle. However, this stretch is falling out of favor among coaches and educators because it poses a higher injury risk than other hamstring stretches.

Although the time required to heal a bone fracture depends upon the health and age of the patient as well as the severity of the fracture, it generally takes several weeks to several months to heal, reports American Academy of Orthopaedic Surgeons.

Shin splints occur when stiff or overworked muscles and tendons in the lower leg begin to pull on the tibia bone and the connective tissues around the bone. Many athletes, particularly runners, experience this painful injury. You can heal most cases of shin splints with rest and other simple remedies.

Swelling that takes place in the body is a result of inflammation. Usually, inflammation is the body's response to infection such as bacteria and viruses. According to the Cleveland Clinic, white cells within the immune system trigger inflammatory chemicals that are meant to protect the body.

While the reverse crunch effectively trains your abdominals, it can be a painful exercise to perform for some individuals. The way the reverse crunch is performed plays a large role in keeping the exercise pain free; however, some people will require modifications to the exercise so that pain does not occur.

Large breasts might be visually desirable, but can be physically painful, causing back, neck and shoulder discomfort and deformity. If your breasts are too large, you might feel self-conscious and you might have trouble finding clothes that fit the way you like.

Relative to contact sports, like football or rugby, baseball appears to be safe. However, the extreme motions involved in pitching and swinging put baseball players at risk of injury. In young players, poor mechanics often contribute to back strains and injuries.