Inclusion Criteria:

• - Diagnosis of spastic primary progressive, secondary progressive, relapsing-remitting MS.

• - EDSS (Extensive Disability Status Scale) Score between 3 and 6.

• - MMSE (Mini-mental state examination) test score> 24.

Exclusion Criteria:

• - Recurrence of MS during 3 months before intervention.

• - Pregnancy and lactation.

• - Having a psychiatric disorder or drug/alcohol abuse.

• - Changes in the symptoms of MS during the study period.

• - Inability to sit without torso support.

• - Inability to stand for at least 10 seconds with support.

- Other neurological or orthopedic diseases of the lower extremities (musculoskeletal diseases, severe osteoarthritis, peripheral neuropathy, joint replacement) - Cardiovascular diseases (recent myocardial infarction, heart failure, uncontrolled hypertension, orthostatic hypotension) - participation in other clinical studies

Multiple sclerosis (MS) is an inflammatory disease of the brain and spinal cord caused by damage to myelin. While the underlying cause of this disease is unknown, a significant relationship has been reported between a series of (CNS) neurons of the central nervous system, immune factors, genetics, and viruses. The primary complaint of MS patients is movement problems, particularly walking disorders, which greatly affect their quality of life, and its improvement is one of the main goals of rehabilitation. Action observation therapy is a new approach. It is used to treat neurological disorders such as cerebral palsy, Parkinson's disease, strokes, and multiple sclerosis. In this method, a video of some purposeful movements and activities recorded by healthy people doing them is shown to the patient, then the person must try to imitate and perform those actions, which causes movement retraining and memory recall. Based on the studies conducted on the effectiveness of neurological treatment methods and proving the effectiveness of this method on other conditions, also considering the involvement of the nervous system in MS and the lack of related studies, we conducted this study with regard to To design a low cost, availability, and ease of use therapeutic method on balance and walking in patients with multiple sclerosis. This study will be conducted on two groups of MS patients. after passing 30 minutes of usual rehabilitation by the blind therapist. One group will watch videos related to action observation exercises and then practice, and for the second group, a video of natural scenery will be shown for the same length of time, then they will practice exercises similar to the first group.

Arms

No Intervention: Control group

Videos of nature will be shown to them, and exercises similar to those in the intervention group will be practiced with them.

Active Comparator: Action Observation group

In the intervention group, the same exercises related to balance and walking are practiced after watching videos of the exercises

Interventions

Behavioral: - Action Observation Therapy

A video clip of a series of exercises is shown to the patients, then they practice them according to mirror neurons and observational learning.