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 asana practice, but also stated that the breathing should be deep breathing with sound. He reiterated this notion in a conference in 2013 stating, "You do normal breath, inhalation and exhalation with sound. Ujjayi breath is a type of prāṇāyāma. This is just normal breath with free flow". In 2014 published on YouTube, Manju Jois dodged the question, "What is the difference between Ujjayi breathing and free breathing?" by saying that "the breathing in Ashtanga should be long and deep with the sound like the ocean". He also states that if you don't make sound, that is okay, too. However