Pure Gym has agreed to buy Denmark’s Fitness World Group for around £350m.
The deal will hand Britain’s biggest health and fitness club operator a further 240 gyms in Denmark, Switzerland and Poland.
The combined business will have a total of nearly 500 gyms, 600,000 members and revenues of £426m.
Pure Gym plans to open a further ten clubs in the UK this month.
Fitness World was put up for sale by Norwegian private equity firm FSN Capital and Kirkbi, the investment vehicle of the family that owns Lego.