Australian fitness franchise F45 has sold 50 franchises in the UK with 15 studios expected to be up and running in the country by the end of year.

F45 currently has two studios in London, one on Tottenham Court Road and the other in Kingston-Upon-Thames. At least another five will open in the next three months.

Of the 50 franchises sold in the UK, 35 will be in London and there will also be a presence in Brighton, Bournemouth, Birmingham and Manchester.

England Rugby player James Haskell is planning to open a studio in Richmond, London, in the next three months, followed by another in the Midlands.

Rob Deutsch, who founded F45 in 2012, told Health Club Management that the growth in the UK is consistent with the company's aggressive expansion plans worldwide.

It has sold 420 franchises globally in the past year taking it tally to 800. Approximately half of these are open. F45 has a presence in 24 countries including in Australia, Brazil, Canada, China, Germany, India, Mexico, Philippines, Qatar, South Africa and US.

Classes are 45-minute high-intensity circuit training workouts in studios that are on average 200-250sq m (2,150-2,690sq ft). Each site holds more than 40 classes each week, with new exercises and equipment regularly introduced.

Deutsch said: "Sessions are fast-paced with a strong community element to ensure users work to their maximum with constant support and guidance from world-class F45 coaches. The popularity of F45 and why studios are popping up all over the world is due to the fact that every day at F45 is different."

He said that its target market for franchise owners are personal trainers, fitness enthusiasts and entrepreneurs, such as bankers, lawyers, stockbrokers who "want more from life than sitting at a desk all day".

Deutsch added: "The target market for end users is 25-40 year old professionals who care about the way they look, but don’t want to be professional athletes. Our client base is 65 per cent females. Those that love their health and fitness, but have a balance. Those that will most likely enjoy a glass of wine on the weekend."