Back muscles are essential for supporting the spine and enabling movement. They are divided into three main groups: the superficial, intermediate, and deep muscles. The superficial muscles, like the latissimus dorsi and trapezius, help with arm movement and posture. The intermediate muscles, such as the rhomboids, assist in retracting the shoulder blades, while the deep muscles, including the erector spinae, play a crucial role in maintaining spinal stability. These muscles work together to facilitate various activities, from lifting and bending to twisting and maintaining balance. Strengthening back muscles can improve overall posture and reduce the risk of injury. Regular exercise, such as rowing or yoga, can help keep these muscles strong and flexible.