The hamstrings are made up of three major muscles. Together they're responsible for hip and knee movements for walking and more. This article breaks it down, including videos and visuals.

The shoulder muscles play a large role in how we perform tasks and activities in daily life. We'll discuss the function and anatomy.

What is the anatomy and function of the quadriceps muscles? Read on to learn more about this muscle group, including common injuries and strengthening exercises.

The gastrocnemius muscle is one of the main muscles of the lower leg. It gives the calf of the leg its rounded, bulging appearance. The gastrocnemius is on the posterior, or back, side of the leg.