My five-year-old son, Ted, is unimpressed at the prospect of a 45-minute Yogi Rascals class. Already a rulebreaker, he does not give two hoots whether yoga will – as its growing number of devotees claim – improve his strength, flexibility, balance, co-ordination, concentration, body confidence or test results. He just thinks it's silly. We therefore do a deal involving chocolate chip cookies. Thankfully, on the day of the class, Ted is upstaged by fellow rascal Sass, also five. Sass is an old hand at yoga and likes to enthuse, loudly, about dinosaurs.

Founder Ladan Sattaripour, originally a Montessori teacher, seems unfazed. She manages to engage Ted and control Sass, along with three older girls, whisking them all off on a story-telling adventure. From their yoga mats, they visit a zoo and a beach, eat ice cream, bark, hiss, moo and swim with dolphins. The class moves fast and she keeps their attention by asking frequent questions.