With a manifesto that includes ‘reaching to the deepest places in yourself’ (mightn’t that pull a muscle?), Fierce Grace sounds extreme. The classes range from 50 minutes – ‘The Fix’ – to 1 hour 45 minutes – ‘The Beast’ – and involve a series of yoga positions in a 38C-hot room. It’s a lot like Bikram: though not as sweltering and the postures flow more smoothly. The most challenging moment is when I find myself uncomfortably close to a classmate in ill-fitting kit (why is it always a gent in short shorts?). Various locations including 200 Regent’s Park Rd, NW1 8BE. Introductory offer: £35 for 30 days"