The team behind family-run gym operator truGym has launched a 1,600sq ft (149sq m) HIIT (high-intensity interval training) boutique studio in Bromley, Kent, with plans for eight sites in London by the end of the year.

truIntensity is targeted at 20-40 year-olds and incorporates eight stations with different exercises based on the workout of the day. Functional workouts include Wheels of Steel, Quarter Back, Condition-X, Big 3, Hit or Miss and Super Torso.

Members can have personal classes or group sessions of up to 20 people, with a monthly membership costing £60 (US$77.10, €65.80). The Bromley club has sold more than 750 memberships in its first three weeks.

truIntensity was created as a sister company to truGym, which boasts 12 health clubs across the UK.

The owners were looking for a smaller franchise model that did not require large financial backing.

Future truIntensity studios will be approximately 175-300sq m (1,884-3,229sq ft) on one floor and "ideally close to residential, retail or main transport locations" with good visibility for both pedestrians and traffic.

A company spokesperson said: "It [truIntensity] is taking the industry by storm and offering fitness professionals the opportunity to join a recognised brand through a franchise programme.

"Our target is 25 sites by the end of 2018."

Last year, the owners launched trampoline park Jump Arena in Leeds, which has since expanded with parks in Luton, Cardiff and Gateshead.