Marc Diaper – Fitness First UK | Global Fitness 100™ 2025
Recognized as one of the top 100 leaders shaping the fitness industry.
Advancing Health and Fitness in the UK
Marc Diaper is Chief Executive Officer of Fitness First, one of the UK’s premier health and fitness networks with 39+ clubs nationwide. Joining the company in July 2025, he brings over 20 years of experience across leadership roles in sales, marketing, and operations, including an eight-year tenure as CEO of Gymbox, where he led one of the UK’s most disruptive fitness brands. Diaper’s leadership blends commercial acumen with creativity, delivering measurable growth, elevated member experiences, and cultural transformation across multi-club operations.
A former personal trainer and sports therapist, Diaper champions innovation and culture-first leadership. He has consistently built high-performing teams, enhanced operational excellence, and elevated customer engagement through data-driven strategies. At Fitness First, he is guiding the next chapter of transformation, strengthening the company’s market position, and reinforcing its commitment to holistic wellness. Marc Diaper secures his place on the Global Fitness 100™ 2025 as a defining force shaping UK fitness innovation and industry standards.
