(NEWSER) – America must be getting really flexible. Some 20.4 million people practice yoga here, a study says, up from 15.8 million in 2008. That's a 29% increase, and it represents 8.7% of the adult population. What's more, some 44.4% of people who don't currently practice yoga would like to try. It's all good news for the industry, which is seeing practitioners spend $10.3 billion yearly on classes and gear—a big boost from $5.7 billion in 2008.