LDC invested alongside founder and CEO Jonathan Davies, who will retain a significant stake in the business.
The company provides personal trainers to UK-based corporate gyms, including gym-operator branded courses for key customers including Fitness First.
TTR currently has an annual turnover of almost £9m and an EBITDA of £3m.
LDC investment director Alastair Weinel said, “With a growing demand from the UK fitness industry for highly qualified personal trainers and gym instructors, TTR is well positioned to maximise future growth.
“We are partnering with a high-quality and entrepreneurial CEO in Jonathan Davies, who has great knowledge of the personal training sector and has successfully built TTR from a zero base over the last seven years.
“The company provides a high-end service to some of the UK’s leading gym providers, and has a network of strategically located course centres right across the UK.
“Going forward, we will work closely with the team to help them execute the next phase of the business’ growth and development.”
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