The investigators have adapted a previously developed balance training program to a highly challenging program specifically directed to MS (HiBalance-MS). This program was recently tested and found feasible in a pilot study. The investigators will now perform a randomized controlled trial in people with MS, in order to determine the effects of the program. The hypothesis is that progressively challenging balance exercise programs that are specific to the balance control domains affected by MS will be effective to improve balance control, walking, motor-cognitive performance, activity performance and health related quality of life. conditions: Multiple Sclerosis conditions: Postural Balance studyType: INTERVENTIONAL phases: NA allocation: RANDOMIZED interventionModel: PARALLEL interventionModelDescription: Randomized controlled trial primaryPurpose: TREATMENT masking: DOUBLE maskingDescription: Investigator and Outcome assessor will not participate in the provided training program. Care provider will not perform the analyses. whoMasked: INVESTIGATOR whoMasked: OUTCOMES_ASSESSOR count: 90 type: ESTIMATED name: HiBalance-MS measure: Mini Balance Evaluation Systems test. measure: 10-Meter Walk Test, maximum speed. measure: 10-Meter Walk Test, self-selected speed. measure: 2-Minute Walk Test, self-selected speed. measure: Gait speed during simultaneous dual task performance. measure: Stride length during dual task gait performance. measure: Step time during dual task gait performance. measure: Response errors in dual task cognitive performance measure: Reaction time in dual task cognitive performance measure: Six-Spot Step Test. measure: Completion time in the Trail Making Test. measure: Number of errors in the Trail Making Test. measure: Immediate and delayed recall in the Ray Auditory Verbal Learning Test. measure: Cognitive processing speed in the Symbol Digit Modalities Test. measure: Cognitive function - composite measure of three cognitive tests. measure: Physical activity level. measure: Physical activity level, self-reported. measure: Physical exercise habits, self-reported. measure: The generic Walk-12 questionnaire. measure: Falls Efficacy Scale - International. measure: Assesment of anxiety with the Hospital Anxiety and Depression Scale. measure: Assesment of depression with the Hospital Anxiety and Depression Scale. measure: Modified Fatigue Impact Scale. measure: Occupational Gap Questionnaire. measure: Acceptance of Chronic Health Condition scale. measure: Multiple Sclerosis Impact Scale - physical impact. measure: Multiple Sclerosis Impact Scale - psychological impact. measure: Euroqol-5 Dimensions-5 Level (EuroQoL-5D-5L). measure: Euroqol Visual Analogue Scale (EQ VAS). measure: World Health Organization Disability Assessment Schedule, version 2.0. (WHODAS 2.0) sex: ALL minimumAge: 18 Years maximumAge: 65 Years stdAges: ADULT stdAges: OLDER_ADULT facility: Karolinska Institutet status: RECRUITING city: Stockholm zip: 17177 country: Sweden name: Sverker Johansson, Ph.D role: CONTACT phone: +46702861260 email: sverker.johansson@ki.se name: Andreas Wallin, Ph.D role: CONTACT phone: +46735137604 email: andreas.wallin@ki.se lat: 59.33258 lon: 18.0649 hasResults: False