Using Google's Trends application (in beta), with which you can see how often a term has been searched for on Google over
time,how frequently your topics have
appeared in Google News stories, and which geographic regions have
searched for them most often, a look at the yoga trend:
Yoga on Google Trends
Vancouver is fourth among the geographic regions, after San Fran, NYC and Pleasanton (??? - will have to look that up). That shouldn't surprise me, but it does.
And thanks to MCPetruk for putting up clips of Krishnamacharya and Iyengar from the 1938 film of a yoga demonstration on YouTube.