The deltoid muscle covers your shoulder joint from back to front, enabling you to abduct, extend and flex your arm. Straining this muscle can cause significant pain and consequently affect your range of motion and strength.

Definition, or cuts, between muscles is best achieved through regularly lifting weights and performing exercises that target specific muscle sets. Strengthening and growing muscles located closely together, such as the bicep in your arm and the deltoid in your shoulder, creates definition between the muscle groups.

The vastus lateralis is one of the four muscles that make up your quadriceps or frontal thigh muscles. The muscle originates at the outer section of the quadriceps, near the hip joint, and inserts at the outer part of your knee. The vastus lateralis assists the other quadriceps muscles in leg extension.

The serratus anterior is a muscle located on the lateral sides of the upper rib cage. Although an unappreciated muscle, the serratus anterior plays a significant role in stabilizing the shoulder joint and shoulder blade. Therefore, damage to this muscle can result in certain anatomical and physiological dysfunction.

The military press is an old-school strength exercise that has stood the test of time. It uses muscles in the upper body and core.

Shoulder mobilization exercises with descriptions and videos to help keep your shoulders limber and pain-free.

Shoulder flexion exercises help you develop strong and muscular shoulders. Try these three shoulder flexion exercises.

Being able to comfortably move your shoulders in extension is a crucial part of shoulder mobility. Practice these exercises regularly for healthy shoulders.

Push up bars can be used for a variety of different exercises that target the various muscles of the shoulder.

The incline bench and military press target the fronts of the shoulders, but to a different degree.

Femoral-acetabular impingement is a painful condition that happens when the ball head of your femoral bone does not have full range of motion in the acetabulum socket of the pelvic bone. Impingement causes pain, inflammation, swelling and decreased hip joint motion.

Osteitis pubis involves inflammation of your pubic bone at the point where the bone meets along the front portion of your body. Inflammation can be caused by a number of factors, including overuse or as a result of trauma, according to SportsInjuryClinic.net, a sport injury website.