I'm looking for an experienced mobile app developer to create a fitness app for both iOS and Android. The primary feature of the app will be workout tracking, and it should include the following functionalities: - Activity Logs: Users should be able to log their workouts in detail. - Progress Charts: Visual representation of users' fitness progress over time. - GPS Tracking: For outdoor workouts, integrating maps and routes. - Leaderboard: Competitive element to engage users by comparing their performance with friends. Ideal skills and experience: - Proficiency in cross-platform mobile app development. - Experience with fitness or health-related applications. - Strong UI/UX design skills to ensure a user-friendly interface. - Familiarity with integrating GPS and real-time data tracking. Please share your portfolio and any relevant experience when bidding.