[3] He is known for arguing, in his own words, that "The invention of postural yoga in late nineteenth- and early twentieth century India is directly linked to the reinvention of sport in the context of colonial modernity and also to the increasing use of physical fitness in schools, gymnasiums, clinics, and public institutions.[10] Stuart Ray Sarbacker, reviewing the book in History of Religions, found the book illuminating on the historical background of yoga, complete with "acerbic asides, including several humorous references to Yoga Journal and its sociological and ideological placement in American consumer society."All the same, she writes, it helped to transform yoga into what Alter called the "tremendously popular, eminently public, self-disciplinary regimen that produces good health and well being, while always holding out the promise of final liberation.[7] The scholar Andrea R. Jain broadly agrees with Singleton, noting that posture "only became prominent in modern yoga in the early twentieth century as a result of the dialogical exchanges between Indian reformers and nationalists and Americans and Europeans interested in health and fitness".[13] The American Historical Review said that Alter's book helps researchers study Gandhi's biopolitics without falling into the trap of seeing "faddish" tendencies in him.