(CNN) — When your shoulders ache or feel stiff, your first instinct might be to stretch or massage them. But the real culprit behind most shoulder problems isn’t surface-level tension — it’s more ...

Your deltoid muscles make up a main muscle group in your upper body. They’re connected with many other muscles and bones in your upper back, neck, and shoulder region and are extremely mobile. They ...

Add Yahoo as a preferred source to see more of our stories on Google. Orthopedic Surgeon is Begging Men Over 40 to Strengthen These Neglected Muscles to Eliminate Chronic Neck and Upper-Back Pain ...

Everyone from fitness novice to elite athlete knows that when you workout hard, it hurts. Post-workout muscle soreness can sometimes be so debilitating you aren't sure if you'll ever hit the gym again ...

Sore muscles can occur any time you exercise in a new way that your body isn't used to, or when you increase the intensity of your usual workouts. Here's what you need to know about why your muscles ...