Marc Diaper, previously CEO of GymBox, has been revealed as the new CEO of Fitness First UK.

He will take up his post on 14 July.

His appointment follows the departure of former CEO, Justin Musgrove, in early May this year.

With over twenty years of industry experience, Diaper worked his way up from being a PT and sports therapist.

He was with Gymbox for 14 years as sales and marketing director and MD and finally CEO – a post he held for eight years, including steering the business through the pandemic.

“I've long admired Fitness First as a pioneer and one of the brands that first introduced us all to fitness," says Diaper. "I'm honoured to join one of the industry’s most iconic brands as CEO."

Chair, Scott Best, said: “Marc is a leader with incredible energy and a proven track record of innovation and growth in the fitness industry. He has an exceptional entrepreneurial drive, with a real passion for team progression and development.

"He also has a clear vision for growth and innovation at Fitness First and I’m confident he’ll propel the business into an exciting new era.”

Diaper said: "I see significant opportunities to build on the great work completed by Scott Best, Justin Musgrove and the team over the past few years and am excited to join such a talented and passionate team as we enter a new and exciting phase of growth.”

Gymbox was acquired by Urban Gym Group in October 2024.