Colleen Saidman Yee, a celebrated yoga teacher in the USA for over 20 years, has faced up to some tough issues in her life, including a heroin addiction when she was younger. Along with famed fashion designer, Donna Karan, and her husband, Rodney Yee, she’s also behind the Urban Zen Integrative Therapy Programme, a pioneering scheme that provides yoga and alternative care to hospital patients throughout the USA. Here, she talks to Cathy Margel about her journey from addiction to a life of wellbeing and the incredible power of yoga.