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 thesurveys and questionnaires, and wear an accelerometer during the interventionperiod;

• 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 orscooter 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 thesurveys and questionnaires, and wear an accelerometer during the interventionperiod.