Cross-Platform Gym App Development

I'm looking for a skilled developer to create a gym app for both iOS and Android platforms. The app should include features like workout logging, progress tracking, and exercise tutorials. Users should be able to log their workouts by selecting from predefined routines.

Key Requirements:
- Cross-platform development expertise (iOS and Android)
- Experience in building fitness or logging apps
- Familiarity with UI/UX design for a seamless user experience
- Ability to implement workout logging and progress tracking features
- Integration of exercise tutorials within the app
- Predefined routines setup for user-friendly workout logging

Ideal Skills:
- Mobile app development (React Native, Flutter, etc.)
- Backend development for data management
- Strong design skills to ensure a user-friendly interface
- Experience with fitness-related applications is a plus

Please provide a portfolio of similar work and an estimated timeline for project completion. Thank you!