The back consists of large, complex muscles that support your trunk and spine. There are many types of back muscles, and they are all essential, helping you walk, bend, twist, and hold your body ...

Lower back pain is a common ailment affecting many Americans, often exacerbated by improper lifting techniques. Excess weight, especially in the midsection, increases strain on lower back muscles, ...

What Is the Psoas Muscle? The psoas (pronounced so-ezz) muscles are two large muscles in your lower back. You have one on either side of your spine. They're the main muscular connection between your ...