Study aim: To determine the effect of dynamic neuromuscular stabilization exercises in comparison to core stability exercises on balance, falling and spasticity in people with multiple sclerosis Design: This study is 2-armed, double-blind RCT compared dynamic neuromuscular stabilization exercise, to core stability exercises in some ambulant individuals with multiple sclerosis. this randomized clinical trial with one to one allocation in two groups (group 1: dynamic neuromuscular stabilization exercise, group 2: core stability exercise). Where the person evaluating the outcome measures is completely blind to the type of exercise each group received. In the case of patients, it is also expected that there will be no difference between the two groups in terms of exercise positions, and duration treatment sessions. Settings and conduct: The intervention is performed in the patient's house because of COVID-19 pandemic. In this study, both the participants and the assessor are blind. Participants/Inclusion and exclusion criteria: Participants are included if they have age range between 30 and 50 , Medium disability score between 2 and 5 based on the "Expanded Disability Status Scale", Obtaining a minimum score of 21 from the Mini Mental Scale Examination, Willingness to participate in the study and sign the consent, having at least middle high school graduation to fill out self-declaration questionnaires Intervention groups: participants in intervention group, will receive "Dynamic neuromuscular stabilization exercise" and in control group, they will receive "core stability exercise" 5 weeks, three sessions per week. Main outcome variables: The main outcomes are "trunk function" and "balance score".