The purpose of this study is to implement the person-centered internet-based Health Action Process Approach to promoting physical activity in people with Multiple Sclerosis (i.e., eHAPA-MS online intervention) and assess the intervention's effectiveness and adherence.
are 18 years old and above; any type of multiple sclerosis have not maintained 30 minutes of MVPA accumulated per day for 2 days of the week during the previous 6 months; be relapse-free for the past 30 days; show low risk for contraindications of physical activity indicated by no more than a single 'yes' response on the Physical Activity Readiness Questionnaire; be able to walk with or without an assistive device; are willing to be randomized to an intervention or control group, complete the surveys and questionnaires, and wear an accelerometer during the intervention period; have a reliable Internet access.
Exclusion Criteria:
have a score >14 for the leisure score index of the Godin Leisure-Time Exercise Questionnaire; No computer or mobile device access with the internet. Patient determined disease steps (PDDS) Score = 7 i.e., using a wheelchair or scooter most of the time, or PDDS Score = 8 being bedridden. Anyone living outside of the United States of America. Anyone who is unable to speak, read and write in English. not willing to be randomized to an intervention or control group, complete the surveys and questionnaires, and wear an accelerometer during the intervention period.
