Retro Gym Tee Design

I'm seeking a talented designer to create a vintage-style illustration for a t-shirt. The design should reflect the essence of an old school gym brand.

Key Requirements:
- Design a retro gym-themed t-shirt
- Illustration-based art style
- Vintage aesthetic

Ideal Skills:
- Experience in vintage/retro design
- Strong illustration skills
- Proficiency in design software (e.g., Adobe Illustrator)

Please include a portfolio showcasing relevant work. Looking forward to your creative proposals!