Participants began the study by completing the first component titled, "Strategies for communicating multiple personalized disease risk estimates." After they were finished with all activities for the first component, they completed the second component titled, "Mental imagery-based self-regulation physical activity intervention." All materials used to recruit participants, screen them for eligibility, consent them, and administer the first component of the study are located in the files for the first component ("Strategies for communicating multiple personalized disease risk estimates"). All materials used for the second component are located in the files for the second component ("Mental imagery-based self-regulation physical activity intervention"). The two components are linked for easy reference. EW note to self: Add link to free version of the manuscript when PubMed Central releases it. Link other components to this project as appropriate, once bug has been fixed.