It’s taken yoga several thousand years to journey from a handful of monasteries dotting the Himalayas to the myriad studios of London, Lower Manhattan, and beyond. Whether bathing with holy men in the Ganges or joining the chorus of a thousand voices chanting “om,” photographer Michael O’Neill decided to devote himself to experiencing and recording the world of yoga at this critical juncture in its history. The result is a powerful photographic tribute to the age-old discipline turned global phenomenon, with over 250 million practitioners united in physical, spiritual, and mindful practice worldwide. Famous for his photographs of the famous, O’Neill first set out to make portraits of the most influential yogis of our time―B. K. S. Iyengar, T. K. V. Desikachar, and Gurmukh Kaur Khalsa, among others―as well as those known for integrating yoga into their high-profile lives, such as Donna Karan, Sting, and Trudie Styler. But as his yoga and meditation practice deepened, so did his drive to look past the personalities and the poses to document the roots of yoga. Over ten years O’Neill trekked beyond the traditional epicenters to meditate with monks in the Tibetan Plateau, live with sadhus in their tents at the Kumbh Mela, and marvel at the boys who practice the little known discipline of Mallakhamba at the wrestling grounds in Kochi.