 Exercise is known to be an important component of treatment programs for patients with neck pain. Recently, many studies have focused on specific training on deep cervical muscles, especially deep cervical flexor and deep cervical extensor muscles.Numerous studies using cranio-cervical flexor exercise as a treatment have revealed reduction on pain, neck disability, changing in activation of deep cervical flexor muscles. Further, the cervical extensor muscles are believed to be equally important for the rehabilitation of patients with neck pain. However, the retention effect of semispinalis cervicis exercise is unknown. Therefore, the semispinalis cervicis exercise still need more evidence to support clinically effects. 