WHEN JOSEPH PILATES created his own brand of core muscle-strengthening exercises in the early 1900s, he probably didn't envisage health-conscious housewives and stressed executives crowding into studios to tighten their abs.
But like yoga, Pilates has become a household name for gentle, low-impact training and as a form of toning the body and clearing the mind.
Anyone who's done Pilates classes knows it mightn't result in a sweat, but it's effective in working muscles in areas previously unknown - and ballet dancers' taut bodies are proof of this theory.
'I must be right. Never an aspirin. Never injured a day in my life. The whole country, the whole world, should be doing my exercises. They'd be happier.' So said Pilates in 1965 - according to the Pilates Method Alliance website - when he was 86.
He had good reason to be enthusiastic. As the creator of the discipline, he knew how to practise it properly - and he lived until he was 87.
Now, with an explosion in its popularity in gyms and through designated studios, there's concern that it's sometimes being taught by instructors without adequate qualifications.