A single source for 84 asanas has yet to be found. The number 84 represents completeness and considered, by some, to be mystical. It is, therefore, entirely possible that 84 asanas was simply the universal standard for codifying a credible yoga system.
The 84 asanas from the Yogoda system was the foundation of Bishnu Charan Ghosh’s College of Physical Education yoga program founded in 1923. And furthered by his student Bikram Choudhury. Bikram popularized the yoga exercise postures with his extremely successful Teacher Training program with hundreds of Bikram Yoga studios around the world. Bikram also helped launch the Bishnu Charan Ghosh Cup in 2003, an International Yoga Asana Championship.