Ashtanga vinyasa yoga Economist", it was reported that "a good number of Mr Jois's students seemed constantly to be limping around with injured knees or backs because they had received his "adjustments", yanking them into Lotus, the splits or a backbend". Tim Miller, one of Jois's students, indicates that "the adjustments were fairly ferocious". Injuries related to Jois's Ashtanga Yoga have been the subject of discussion in a "Huffington Post" article In 2008, yoga researchers in Europe published a survey, that lacked a control group therefore limiting internal validity, of practitioners of Ashtanga Yoga indicating that 62 percent of the respondents had suffered
Ashtanga vinyasa yoga classes in similar style, offering posture variations, and teaching Ashtanga in a much less linear style, with a greater emphasis on alignment and breathing. Sharath's "new generation" of young students have adopted Sharath's new rules, and teach in a linear style without variations. According to the Sharath generation, variations are not allowed, and practice must be in a strict Mysore environment under the guidance of a Sharath-approved teacher. How-to videos & workshops, detailed alignment instructions, and strength-building exercises are not part of the method, neither for the practitioner or the teacher. These types of instruction are not approved by Sharath,