What muscles are used for waist extension?

Waist extension primarily involves the erector spinae muscles, which run along the spine and are responsible for extending and stabilizing the back. Additionally, the multifidus and semispinalis muscles also contribute to this movement by helping to extend and rotate the spine. The gluteus maximus may assist in waist extension, particularly when the movement involves the hip joint. Together, these muscles work to maintain posture and facilitate movements involving the lower back.