Cross-Platform Gym App Development

I'm looking for an experienced app developer to create a comprehensive gym application for both iOS and Android platforms. The app should include the following primary features:

- BMI Calculator
- Diet Calculator
- Exercise Management

Ideal Skills and Experience:

- Proven experience in developing cross-platform apps.
- Strong knowledge of fitness and health-related applications.
- Proficiency in both iOS and Android development.
- UI/UX design skills to ensure a user-friendly experience.
- Ability to integrate calculators and management tools seamlessly.

Please share your portfolio and relevant experience.