John Treharne, founder of The Gym Group, will step down from his role as CEO in September.

The surprise announcement was made this morning (30 May) by the company's board.

Treharne has led the Company through its first 10 years, growing the portfolio from a single gym in Hounslow to 133 gyms today.

In a statement, the board said Treharne is stepping down to "leave more time for his family and personal interests".

"John will remain on the board as founder director, continuing to provide the benefit of his immense network and experience across the sector with a focus on nurturing culture and entrepreneurial activity," the statement said.

Treharne will be replaced by Richard Darwin, currently the company’s chief financial officer.

Darwin joined The Gym Group prior to the Company’s IPO in 2015 and has worked closely with Treharne in delivering the group's rapid profit growth and site expansion. The company has begun the process to appoint a new CFO.

Penny Hughes, The Gym Group's chair, said: “On behalf of the entire Gym Group team, I would like to acknowledge John’s extraordinary achievement in pioneering the low cost fitness model and developing The Gym Group into the fastest growing company in the sector across Europe.

"His passion, vision and innovation have built a start-up into a market leader and provided access to fitness for all.

"We are all delighted that John will continue to contribute to the business which he founded and that The Gym will still benefit from his vast experience and knowledge.

“We are fortunate to have such an able successor for the CEO role in Richard Darwin. Richard has unrivalled experience and knowledge of both the multi-site leisure industry and the Company, having been instrumental in delivering and executing The Gym Group’s strategy with John since IPO.

"He is uniquely equipped to continue to drive The Gym Group along its planned growth trajectory and deliver its next exciting phase of development.”

John Treharne was interviewed for the current, May issue of Health Club Management. To read the full interview, click here.