The back is the posterior part of the human torso, stretching from the base of the neck down to the lower waist or pelvis. It includes the spine (or vertebral column), which provides structural support and protects the spinal cord. Surrounding the spine are muscles, ligaments, and tendons that support posture, enable movement, and stabilize the upper body. Major muscle groups in the back include the trapezius, latissimus dorsi, and erector spinae, which help with actions like bending, twisting, lifting, and maintaining balance. The back also contains the ribs, which help protect vital organs in the chest. Proper care of the back is important for overall mobility, strength, and health, as it plays a key role in almost every physical activity.

Would you like me to focus on any specific part or function of the back?