Inclusion (Child):

• Ages 3-4 years.
• Parent report that they meet 0 or 1 recommendation for physical activity, sleep, and screen-time as defined by the 24-hour movement guidelines. The physical activity recommendation is defined as greater than or equal to 3 hours/day of total physical activity, including 1 hour of moderate-to-vigorous physical activity. The sleep recommendation is defined as 10-13 hours/day. The sedentary behavior recommendation is defined as less than or equal to 1 hour/day of sedentary screen-time.

Inclusion (Parents):

• Parents must agree to use their mobile phone for the duration of the study (~12 weeks) and download the mobile app onto their phone.
• The parent/caregiver is fluent in English to participate in testing the mobile app.
• The parent/caregiver must be willing to travel to KUMC to complete study visits.

Exclusion (child):

• Mobility limitations as reported by the parent.
• Meeting two or more recommendations for physical activity, sleep, and screen-time.
• Sibling or household member is participating or participated in the study.