ERD and DFD for GYM System

I'm looking for a professional who can help me with creating an Entity-Relationship Diagram (ERD) and Data Flow Diagram (DFD) for a GYM project.

Requirements:
- Design a robust ERD for the project's database
- Create a detailed DFD at Level 2 and below

Ideal Skills:
- Proficiency in database design and system documentation
- Experience in creating ERD and DFD
- Familiarity with the GYM industry will be a plus