The sciatic nerves stretch from your lower back to your feet. During pregnancy, the extra weight can cause stress and strain on the sciatic nerve. This can trigger pain known as sciatica.

You may attribute a sensation of weakness to many potential causes. Should the symptom continue beyond a few days or become extremely acute, contact your doctor or an emergency medical provider immediately.

The anterior cruciate ligament, or ACL, controls the motion of the shin and thigh bones. ACL tears occur when the knee becomes unstable and buckles. ACL injuries are often the result of sports injuries and are frequently treated with surgery for patients who want to continue to lead an active lifestyle.

Hyperextension of the shoulder involves the rotator cuff muscles and the shoulder joint, also known as the glenohumeral joint.

Many physical activities and sports require jumping. When you land following a jump, your knees are at risk for injury because a great deal of force is placed on your bones, muscles and joints. This force can lead to strains, sprains and muscle tears.

The infraspinatus muscle is on the lower back of the scapula, or shoulder blade. It attaches to the humerus, the long bone in the upper arm, near the shoulder joint. When reaching out to the side and behind, this muscle contracts to complete this motion.

You might not think about your great toe’s function all that much, but when it does not function within its proper range of motion, you are likely to notice right away because it will lead to problems with your walking gait. If it malfunctions for long enough, it will also cause pain.

You may have prepared yourself for the blood, sweat and tears you experience from exercise. You accept minor aches and pains in your muscles as part of the process. What may be surprising you, however is pain in your throat after exercising. This is not uncommon, though, especially for people with asthma.

Most runners experience knee pain at some point, particularly if they run on hard surfaces like concrete and asphalt. Much of this pain has to do with the high-impact nature of running, which sends shockwaves up the lower body and compresses bone and cartilage against one another.

In order for movement to occur, the muscles, bones, tendons and ligaments must all work together in response to signals from the brain. If there is any disease or condition that interrupts the nerves' signals or if there is any injury to any of these structures, movement can be hindered.

A knee immobilizer is a type of brace worn on the leg to lock the knee in extension and prevent motion of the joint. According to the American Academy of Family Physicians, a knee immobilizer is often used after an acute injury to the knee, such as a ligament rupture or a fracture.

Pullups are not inherently dangerous like some upper-body exercises, such as dips. However, because of the overhead arm position and shoulder movement involved in the pullup, you could experience a rotator cuff injury.