Confirmed diagnosis of Pediatric-Onset MS (\<18 years) according to the 2017 revised McDonald criteria (relapsing-remitting)

Expanded Disability Status Scale (EDSS) ≤ 5.0

Relapse free for the past 30 days (including no corticosteroids)

No contraindications to physical activity, including pregnancy

Participant and parent (if between 15 and 18 years of age) written informed consent.

Impact of Physical Activity on Cognitive Outcomes in Youth With Pediatric-Onset Multiple Sclerosis (POMS)