The five major muscles of the back are the trapezius, latissimus dorsi, the rhomboids, the erector spinae, and the levator scapulae. Back muscles are grouped into three categories.

How to prevent lower back pain. Jump start your efforts with reducing belly fat. Body fat is stored in two ways. Fat stored beneath the skin and above the layer of muscle is called subcutaneous ...

The "Paper Clip Syndrome" starts with a bulging midsection that places considerable and relentless stress on the lower back muscles. This is because the anatomy of the human body creates a natural ...

Latissimus dorsi — the largest muscle in the upper body, which runs from the shoulders to the lower back and supports extending and rotating your arms and shoulders.

An early 20th-century medical illustration shows the deep muscles of the lower back, including the psoas. Photograph by VintageMedStock/Getty Images. Why tight hip flexors can cause back pain.