It is an interventional study that proves the eficacy of the manual therapy with active manual therapy and combined with exercise in cervical pain.

The study will be divided in two different groups:

• A control group (group A) : they will receive a treatment with manual therapy and physical exercise.
• An experimental group (group B) : they will receive the previous treatment, but also the pacient's do active muscle active contraction.

The exercise is compound by a home program of several exercises with diferent difficulties.

The contraction will consist on a combination of concentric and isometric work. being the patient's pain threshold the one that will guide us to the choice of the predominance of concentric or isometric contraction . Both groups will be joined by a five-minute work on pain education.

Inclusion Criteria:

• accept to participate in the study, through informed consent
• subjects with chronic nonspecific neck pain lasting equal to or more than 3 months

Exclusion Criteria:

• Present neck pain caused by serious pathology such as: inflammatory, congenital, infectious, metabolic and neoplastic diseases.
• Cervical pathology of traumatic origin with less than 6 months of evolution.
• Rheumatic diseases.
• Neck pain with neurological signs such as: radiculopathy and myelopathy.
• Previous surgery of the cervical spine.
• Pregnancy.
• Have received physiotherapeutic treatment in the cervical region during the month prior to the inclusion of the study.
• Have the intention of receiving other physiotherapeutic treatments different from the one proposed during the study period.
• Present serious mental disorders.