The shoulder muscles are responsible for maintaining the widest range of motion of any joint in your body. This flexibility is also what makes the shoulder prone to instability and injury. Muscles, ...

Your rhomboid muscles connect your shoulder blade (scapula) to your spine. If your rhomboid muscles hurt, you’ll feel it in your back and shoulders. “The rhomboids can become painful because of ...

Your rotator cuff includes several muscles that support range of motion in your arm and shoulder while holding the socket in place. The rotator cuff is a group of four muscles that hold your upper arm ...

Bigger muscles have long been associated with strength, confidence and vitality. Visually, they create a powerful silhouette that signals athleticism and capability, which is one reason muscle ...

Upper back pain between the shoulder blades may result from poor posture or muscle strain. However, it can also stem from more serious problems with the spine, such as scoliosis or osteoarthritis.

Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...