Lack of regulation for specialist classes leaves UK fitness enthusiasts at risk, say professional bodies

The boom in reformer pilates has created a “wild west” of studios where poor regulation has resulted in inexperienced teachers and a rise in injuries, professional standards bodies have warned.

Pilates is not formally or legally regulated, and as its popularity has surged, industry experts say, so too has the growth of packed reformer-based classes often led by instructors with limited training.

One of the fastest-growing fitness trends is also one of the most divisive. To its fans, it promises a stronger, healthier body; to its critics, it’s another way to make women feel insecure. Time to sort fact from fiction

I have noticed something new in my London neighbourhood. Amid the sea of nail salons, vape shops and purveyors of fried chicken, sleek, opaque-fronted premises are popping up everywhere. There are several within 15 minutes of my home.

At weekends, you can spot clusters of devotees heading to these mysterious, vaguely aspirational temples of self-care, AKA reformer pilates studios. Many of these devotees conform to an aesthetic popularised on TikTok via hashtags such as #pilatesprincess. There is definitely a uniform: pink athleisure, Rhode phone cases and oversized pastel-coloured Stanley tumblers, jokingly referenced on Instagram as “emotional support” bottles. It is a trend that prompted New York magazine to run an article under the headline “Why Pilates Keeps Pissing People Off”: the workout has become inseparable from a very strict idea of womanhood.

When organisers posted a TikTok promoting 45-minute pilates sessions, the video amassed 2m views. Now plans are afoot for female classes and youth clubs

It’s early afternoon on a gloomy day at the Jamia Usmania mosque in Bradford and a group of mostly elderly men have finished their midday prayers.

The assembly of mainly retired men would usually return to the familiar drumbeat of day-to-day life, but instead they make their way downstairs to tackle squats, glute bridges and the butterfly position in the mosque’s weekly 45-minute pilates class.