London-based yoga instructor Stacie Graham is on a mission to make the ancient practice, now a $30 billion-a-year industry according to the Global Wellness Institute, more racially and socially diverse. "Here we are in London. If you go to any space where there is a gym or yoga studio, you will likely not see 'London', but typically white, female, able bodies -- middle class -- participating," she says. Graham urges London yoga teachers to be "warriors for change" via regular workshops where she presents strategies from her new book "Yoga as Resistance". Attendee Ntathu Allen, who specialises in breathing and healing sessions for women of colour, tells AFP that she is sometimes asked "if I'm really a teacher" when she arrives at a new studio. IMAGES AND SOUNDBITES