The population of the research will be participants with multiple sclerosis. The 30-second sit-to-stand test will be performed in the participant's home environment. . Patients will be instructed to cross their arms over their chest and complete as many standing cycles as possible in 30 seconds, standing until fully upright and then sitting until the hips touch the chair without the assistance of the hands. Inter-rater reliability will be assessed by two different raters in the same video interview. In contrast, intra-rater reliability will be evaluated by analyzing the number of repetitions recorded by the same rater in two different video interviews conducted 24-28 hours apart.
