A Health Action Process Approach Online Intervention for People With Multiple Sclerosis

Inclusion Criteria:

• 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 weekduring 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 asingle '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 surveysand 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 ExerciseQuestionnaire;
• No computer or mobile device access with the internet.
• Patient determined disease steps (PDDS) Score = 7 i.e., using a wheelchair or scootermost 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 surveysand questionnaires, and wear an accelerometer during the intervention period.