Xponential Fitness has acquired US-based boutique chain Yoga Six for an undisclosed sum – making it the sixth business in Xponential's rapidly growing portfolio of fitness brands.

Yoga Six currently operates 12 studios in five US cities – San Diego, Chicago, St. Louis, Milwaukee and Columbus. Seven of the sites will be operated by Xponential, with the other five being under franchise deals.

Founded in 2012, Yoga Six offers a broad range of heated and non-heated yoga classes, boot camp style fitness classes and meditation. Class formats include Stretch and Restore, Slow Flow, Hot Yoga, Vinyasa, Power Yoga and Performance.

Yoga Six will join Xponential's five other fitness brands – Club Pilates, CycleBar, StretchLab, Row House and AKT.

"Adding Yoga Six to Xponential Fitness was a perfect fit for our portfolio as it is a great complement to our already robust suite of brands," said Anthony Geisler, CEO of Xponential Fitness.

"Up until this point, primarily San Diego and Midwestern consumers have had the opportunity to experience Yoga Six, and we now look forward to expanding the brand through franchising across the country."

US-based Xponential kicked off its global expansion in the UK this year, following a master franchise agreement with entrepreneur Oliver Chipp.

Chipp expects to open at least 30 CycleBar studios in UK over the next five years, with the first studio set to open in London this month.

Xponential is led by a team of industry veterans who have experience of building fitness brands internationally.

CEO Anthony Geisler developed LA Boxing into a successful boxing, kickboxing and mixed martial arts fitness concept, before selling it on.

John Kersh – who helped grow Anytime Fitness into a global business – has also joined the team as chief international development officer.

"What we're creating at Xponential Fitness hasn't been done before and there's enormous consumer interest in boutique fitness across the globe that we intend to capitalise on," said Kersh.

Xponential is backed by financial partner TPG Growth, a growth equity platform of alternative asset firm TPG.