 The study aimed to develop an mHealth app called Wheels to promote a healthy lifestyle for wheelchair users with spinal cord injury or lower limb amputation. The app was developed using the intervention mapping framework and included six behavior change strategies to improve physical activity, dietary, sleep, and relaxation behaviors. The pilot study involved 21 participants who completed the study, and results showed positive developments in body composition, body mass, BMI, daily grams of fat consumed, and sleep quality score. Overall, the app showed promising results and is feasible to deploy on a larger scale. This article was authored by Der Kovanars, Jasmine F. M. Hala, Leone T. Lu, and others.