US-based health club chain 24 Hour Fitness has kept up its rapid pace of expansion with two new club openings in May.

The two new clubs – in Portland, Oregon and Castle Rock, Colorado – take the number of clubs in the group’s portfolio closer to 450.

The 40,000sq ft, two-storey club in Castle Rock has been designed as an open-floor plan gym.

Facilities include Large studio spaces for indoor cycling and GX24 studio classes, a functional training area and a full-sized basketball court. There is also a “Turf Zone” – a new addition to 24 Hour Fitness – featuring a strip of artificial grass fitted with specialised fitness equipment designed both for athletes and non-athletes. Wet facilities include a spa, indoor lap pool and sauna.

The new, 38,000sq ft club in Portland has similar facilities but will also house an area for TRX Suspension Training.

The openings come following the appointment of Frank Napolitano as acting CEO of the group. Mark Smith, who had been CEO since 2014 – when after Forstmann Little sold the gym chain to a group of North American investors for US$1.9bn (€1.4bn, £1.3bn) – stepped down from his role in March.

Headquartered in California, 24 Hour Fitness serves nearly 4 million members in 430 clubs across the US.