The Step for Tree app faces several challenges, including maintaining long-term user engagement, ensuring accurate activity tracking across various devices, and verifying that user contributions result in real tree planting. Financial sustainability is a concern, as the app needs to balance supporting its environmental goals with covering operational costs. Additionally, fostering a strong, active community of users from diverse regions, ensuring data privacy and security, and scaling tree planting efforts as the user base grows are key obstacles. The app must also be inclusive for all fitness levels and avoid overwhelming users with too many competing goals, all while maintaining a clear and motivating balance between fitness and environmental impact.