Most people think of the inner and outer thigh when they hear the words adductors and abductors. While that's partially true, a simpler, more accurate description is that abductors are the muscles that draw a part away from the midline of the body, and adductors draw a part into the midline of the body.

Rehabilitative exercises are important following any surgery, but it is especially critical after a hip replacement. Recovery from a total hip replacement can take months, and it is imperative that you exercise the muscles of your hip to help prevent deterioration of tissue and to speed your recovery.

The sacroiliac joint, also called the SI joint, sits at the bottom of your spine and makes up the rear portion of your pelvic girdle. The human body actually has two -- one sits at the left side of the pelvis and the other sits on the right. Sacroiliac joint dysfunction is a possible cause of lower-back pain.

The step-up is a compound exercise that works several lower-body muscles. It is a good strength exercise since it mimics a real-life movement, making it more functional than other lower-body strength exercises.

Stair climbing is an exercise that uses your natural body weight to tone muscles in the hips, buttocks and thighs. Weight-bearing aerobic activities such as stair climbing can help reduce the rate of bone loss while providing cardiovascular benefits.

Assessing your vertical jump height can give you an idea of where you rank compared to other student athletes, and can clue you in to whether you need to work on your jump height before you try out for a sport.

Knee pain while squatting is often a symptom of injury or dysfunction in another joint. There are several possible causes for the pain. These causes often involve lack of mobility at the ankle or hip joints.

Six hip flexor muscles are in your body. The most important are the iliopsoas, which are two muscles, the psoas major and iliacus, and are situated deep in the abdomen and the rectus femoris, part of the quadriceps muscles on the thigh. Tightening the hip flexors bends the hip in the front.

Hip replacement is a serious procedure. However, with proper rehabilitation you can regain all previous strength and range of motion. The best rehabilitation involves careful planning and exercise routines.

If you experience occasional pelvic pain after exercising, it's likely not a major cause for concern, as it's not unusual to have pain in your pelvis or abdomen after you work out, especially if you exercise hard.

The deadlift is a compound move that works many muscle groups, including your hamstrings, core, glutes, lower back, upper back, mid-back and forearms. Because the deadlift works so many muscles, there is a temptation to keep loading weight on the bar as you progress.

Squatting, done properly, compresses the spine -- but we have evolved to tolerate spinal compression. Assuming you don't bounce off something hard at the bottom of the squat, the spinal compression forces are extremely low and should present no risk unless you have a pre-existing spinal injury.