1. Haṭha-Yoga: Its Context, Theory, and Practice;Burley,2000
2. Trends in the use of complementary health approaches among adults: United States, 2002-2012;Clarke;Natl Health Stat Report,2015
3. Characteristics of yoga users: Results of a national survey;Birdee;J Gen Intern Med,2008
4. Now trending: Worldwide survey of fitness trends for 2014;Thompson;ACSMs Health Fit J,2013
5. Worldwide survey of fitness trends for 2015: 10th anniversary edition;Thompson;ACSMs Health Fit J,2014