The multifidus is a group of small muscles located along the spine. These muscles play a crucial role in stabilizing the vertebral column and supporting proper posture. They help maintain balance and control during movement, making them essential for activities like walking and lifting. In addition to stability, the multifidus muscles assist in spinal rotation and extension. They work in conjunction with other core muscles to protect the spine from injury and strain. Strengthening the multifidus can improve overall back health and enhance athletic performance.